Revert of iOS: Use JSON for GN configuration instead of MB + remove symbols

Revert of iOS: Use JSON for GN configuration instead of MB + remove symbols (patchset #4 id:80001 of https://codereview.webrtc.org/2688103002/ )

Reason for revert:
Something is different from trybots vs the commit bots, causing it to fail when running GN: 
https://build.chromium.org/p/client.webrtc/builders/iOS32%20Release/builds/10151

Original issue's description:
> iOS: Use JSON for GN configuration instead of MB + remove symbols.
> 
> This aligns with how the ios recipe module is used in Chromium.
> It should prevent breakages like one we had recently.
> 
> It also means we're no longer setting symbol_level=1 explicitly. 
> The default is 0 (no symbols), which is now what's being used.
> 
> Also move all the directories containing JSON files into
> tools-webrtc/ios/bots to make it clearer (and more similar to
> Chromium).
> 
> BUG=webrtc:7140, webrtc:7161
> NOTRY=True
> 
> Review-Url: https://codereview.webrtc.org/2688103002
> Cr-Commit-Position: refs/heads/master@{#16633}
> Committed: https://chromium.googlesource.com/external/webrtc/+/73f01de4edda30c419bf6daf8b91d2a0d28c06a9

TBR=ehmaldonado@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7140, webrtc:7161
Review-Url: https://codereview.webrtc.org/2694423002
Cr-Commit-Position: refs/heads/master@{#16634}
Committed: https://chromium.googlesource.com/external/webrtc/+/68ab366547b7494b69e28047b17ad2ebd64e9edd

[kjellander_webrtc, 2017-02-15 20:45:26]

The CQ bit was checked by kjellander@webrtc.org

[kjellander_webrtc, 2017-02-15 20:45:27]

Created Revert of iOS: Use JSON for GN configuration instead of MB + remove
symbols

[commit-bot: I haz the power, 2017-02-15 20:45:28]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-02-15 20:45:36]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487191526744610, "parent_rev":
"73f01de4edda30c419bf6daf8b91d2a0d28c06a9", "commit_rev":
"68ab366547b7494b69e28047b17ad2ebd64e9edd"}

[commit-bot: I haz the power, 2017-02-15 20:45:39]

Description was changed from

==========
Revert of iOS: Use JSON for GN configuration instead of MB + remove symbols
(patchset #4 id:80001 of https://codereview.webrtc.org/2688103002/ )

Reason for revert:
Something is different from trybots vs the commit bots, causing it to fail when
running GN: 
https://build.chromium.org/p/client.webrtc/builders/iOS32%20Release/builds/10151

Original issue's description:
> iOS: Use JSON for GN configuration instead of MB + remove symbols.
> 
> This aligns with how the ios recipe module is used in Chromium.
> It should prevent breakages like one we had recently.
> 
> It also means we're no longer setting symbol_level=1 explicitly. 
> The default is 0 (no symbols), which is now what's being used.
> 
> Also move all the directories containing JSON files into
> tools-webrtc/ios/bots to make it clearer (and more similar to
> Chromium).
> 
> BUG=webrtc:7140, webrtc:7161
> NOTRY=True
> 
> Review-Url: https://codereview.webrtc.org/2688103002
> Cr-Commit-Position: refs/heads/master@{#16633}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/73f01de4edda30c419bf6daf8...

TBR=ehmaldonado@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7140, webrtc:7161
==========

to

==========
Revert of iOS: Use JSON for GN configuration instead of MB + remove symbols
(patchset #4 id:80001 of https://codereview.webrtc.org/2688103002/ )

Reason for revert:
Something is different from trybots vs the commit bots, causing it to fail when
running GN: 
https://build.chromium.org/p/client.webrtc/builders/iOS32%20Release/builds/10151

Original issue's description:
> iOS: Use JSON for GN configuration instead of MB + remove symbols.
> 
> This aligns with how the ios recipe module is used in Chromium.
> It should prevent breakages like one we had recently.
> 
> It also means we're no longer setting symbol_level=1 explicitly. 
> The default is 0 (no symbols), which is now what's being used.
> 
> Also move all the directories containing JSON files into
> tools-webrtc/ios/bots to make it clearer (and more similar to
> Chromium).
> 
> BUG=webrtc:7140, webrtc:7161
> NOTRY=True
> 
> Review-Url: https://codereview.webrtc.org/2688103002
> Cr-Commit-Position: refs/heads/master@{#16633}
> Committed:
https://chromium.googlesource.com/external/webrtc/+/73f01de4edda30c419bf6daf8...

TBR=ehmaldonado@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7140, webrtc:7161

Review-Url: https://codereview.webrtc.org/2694423002
Cr-Commit-Position: refs/heads/master@{#16634}
Committed:
https://chromium.googlesource.com/external/webrtc/+/68ab366547b7494b69e28047b...
==========

[commit-bot: I haz the power, 2017-02-15 20:45:41]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/68ab366547b7494b69e28047b...

[kjellander_webrtc, 2017-02-15 21:05:58]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/2697133002/ by kjellander@webrtc.org.

The reason for reverting is: Preparing reland CL.