Delete talk directory, and references from build_ios_libs.sh.

PRESUBMIT.py

Index: PRESUBMIT.py
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 00bcc3e545910a89f381d575d74d94e877bff554..f07f49b9c83b72deee97583389b3cc87d2777f95 100755
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -63,7 +63,6 @@ NATIVE_API_DIRS = (
 # These directories should not be used but are maintained only to avoid breaking
 # some legacy downstream code.
 LEGACY_API_DIRS = (
-  'talk/app/webrtc',
   'webrtc/base',
   'webrtc/common_audio/include',
   'webrtc/modules/audio_coding/include',
@@ -459,6 +458,7 @@ def _CommonChecks(input_api, output_api):
                         ],
       pylintrc='pylintrc'))
 
+  # TODO(nisse): talk/ is no more, so make below checks simpler?

[kjellander_webrtc, 2016/08/31 15:39:52]

That would be nice, to use presubmit_canned_checks.PanProjectChecks instead of
duplicating a lot like below!
See
https://cs.chromium.org/chromium/tools/depot_tools/presubmit_canned_checks.py...

[nisse-webrtc, 2016/09/01 13:32:06]

I'd need some more detailed guidance if you want me to do that in this cl, I'm
not familiar at all with the presubmit logic.

[kjellander_webrtc, 2016/09/01 13:49:15]

No let's do it in the future. I filed
https://bugs.chromium.org/p/webrtc/issues/detail?id=6292 to track that.

   # WebRTC can't use the presubmit_canned_checks.PanProjectChecks function since
   # we need to have different license checks in talk/ and webrtc/ directories.
   # Instead, hand-picked checks are included below.