Remove the rtc_relative_path GYP variable and similar defines

Remove the rtc_relative_path GYP variable and similar defines

This is a reland of https://codereview.webrtc.org/1903553003/ but with
the SRTP changes removed, since they're needed downstream.

The defines that can be used to alter the include paths for Expat and gtest
are no longer needed in WebRTC or Chromium. Remove them to simplify GYP.

Removed defines:
EXPAT_RELATIVE_PATH
GTEST_RELATIVE_PATH

They're all set in the Chromium build so this shouldn't affect Chromium:
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/libjingle/libjingle.gyp

BUG=webrtc:4256
NOTRY=True
NOPRESUBMIT=True
TBR=perkj@webrtc.org

Committed: https://crrev.com/081254f2c62037d016f9fc961764c6f01cb095da
Cr-Commit-Position: refs/heads/master@{#12536}

[kjellander_webrtc, 2016-04-27 17:13:12]

The CQ bit was checked by kjellander@webrtc.org

[commit-bot: I haz the power, 2016-04-27 17:13:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1925733002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1925733002/1

[commit-bot: I haz the power, 2016-04-27 17:13:28]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-01 22:00:57]

Description was changed from

==========
Remove the rtc_relative_path GYP variable and similar defines

This is a reland of https://codereview.webrtc.org/1903553003/ but with
the SRTP changes removed, since they're needed downstream.

The defines that can be used to alter the include paths for Expat and gtest
are no longer needed in WebRTC or Chromium. Remove them to simplify GYP.

Removed defines:
EXPAT_RELATIVE_PATH
GTEST_RELATIVE_PATH

They're all set in the Chromium build so this shouldn't affect Chromium:
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/libjin...

BUG=webrtc:4256
NOTRY=True
NOPRESUBMIT=True
TBR=perkj@webrtc.org
==========

to

==========
Remove the rtc_relative_path GYP variable and similar defines

This is a reland of https://codereview.webrtc.org/1903553003/ but with
the SRTP changes removed, since they're needed downstream.

The defines that can be used to alter the include paths for Expat and gtest
are no longer needed in WebRTC or Chromium. Remove them to simplify GYP.

Removed defines:
EXPAT_RELATIVE_PATH
GTEST_RELATIVE_PATH

They're all set in the Chromium build so this shouldn't affect Chromium:
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/libjin...

BUG=webrtc:4256
NOTRY=True
NOPRESUBMIT=True
TBR=perkj@webrtc.org

Committed: https://crrev.com/081254f2c62037d016f9fc961764c6f01cb095da
Cr-Commit-Position: refs/heads/master@{#12536}
==========

[commit-bot: I haz the power, 2016-05-01 22:00:58]

Patchset 1 (id:??) landed as
https://crrev.com/081254f2c62037d016f9fc961764c6f01cb095da
Cr-Commit-Position: refs/heads/master@{#12536}

[phoglund, 2016-05-04 07:51:28]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.webrtc.org/1945803003/ by phoglund@webrtc.org.

The reason for reverting is: Breaks downstream gtest usage..