Gyp deprecation announcement: https://groups.google.com/a/chromium.org/forum/#!topic/chromium-dev/NZkPr-CXvQ0

cc'd wolenetz@ in case we need to coordinate around FFmpeg roll.

Not fully blocking the ffmpeg roll, but linking that bug here to keep it on my radar when rolling.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/third_party/ffmpeg/+/60c4d8202189e8c65c6a11e5ed4597a879a839a2

commit 60c4d8202189e8c65c6a11e5ed4597a879a839a2
Author: Chris Watkins <watk@chromium.org>
Date: Thu Aug 25 22:45:17 2016

Delete gyp files

Gyp is no longer supported. This deletes the gyp files and updates all
references to them. generate_gyp.py is renamed to generate_gn.py.

BUG= 641113 
TEST=generate_gn_unittest.py fails 11/19 with and without this change

Change-Id: I51d9bd064ac1c480153da229638174e6e80a95a1
Reviewed-on: https://chromium-review.googlesource.com/376120
Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>

[rename] https://crrev.com/60c4d8202189e8c65c6a11e5ed4597a879a839a2/chromium/scripts/generate_gn.py
[rename] https://crrev.com/60c4d8202189e8c65c6a11e5ed4597a879a839a2/chromium/scripts/generate_gn_unittest.py
[modify] https://crrev.com/60c4d8202189e8c65c6a11e5ed4597a879a839a2/README.chromium
[delete] https://crrev.com/75976ae026fdbedb14f006eec6cd9119c543aa7f/ffmpeg_generated.gypi
[modify] https://crrev.com/60c4d8202189e8c65c6a11e5ed4597a879a839a2/BUILD.gn
[modify] https://crrev.com/60c4d8202189e8c65c6a11e5ed4597a879a839a2/chromium/scripts/build_ffmpeg.py
[delete] https://crrev.com/75976ae026fdbedb14f006eec6cd9119c543aa7f/ffmpeg.gyp
[modify] https://crrev.com/60c4d8202189e8c65c6a11e5ed4597a879a839a2/chromium/patches/README

I just realized that 54 hasn't actually branched yet. We'll be fine as long as no one does a deps roll before the 54 branch

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cd8f9885e1a55d7388056632f12723481181dcfb

commit cd8f9885e1a55d7388056632f12723481181dcfb
Author: watk <watk@chromium.org>
Date: Sat Aug 27 11:07:58 2016

Delete gyp files from media/

After this CL there are no more references to gyp anywhere in media/.

BUG= 641113 

Review-Url: https://codereview.chromium.org/2279593004
Cr-Commit-Position: refs/heads/master@{#414923}

[modify] https://crrev.com/cd8f9885e1a55d7388056632f12723481181dcfb/media/BUILD.gn
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/base/ipc/media_base_ipc.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/blink/media_blink.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/capture/capture.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/cast/cast.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/cast/cast_testing.gypi
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/cast/cast_testing_tools.gypi
[modify] https://crrev.com/cd8f9885e1a55d7388056632f12723481181dcfb/media/cast/test/proto/BUILD.gn
[modify] https://crrev.com/cd8f9885e1a55d7388056632f12723481181dcfb/media/cdm/cdm_paths.cc
[modify] https://crrev.com/cd8f9885e1a55d7388056632f12723481181dcfb/media/cdm/ppapi/BUILD.gn
[modify] https://crrev.com/cd8f9885e1a55d7388056632f12723481181dcfb/media/cdm/ppapi/external_clear_key/cdm_video_decoder.h
[modify] https://crrev.com/cd8f9885e1a55d7388056632f12723481181dcfb/media/cdm/ppapi/ppapi_cdm_adapter.gni
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/cdm_paths.gypi
[modify] https://crrev.com/cd8f9885e1a55d7388056632f12723481181dcfb/media/ffmpeg/ffmpeg_common.h
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/gpu/ipc/media_ipc.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/media.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/media_cdm.gypi
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/media_cdm_adapter.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/media_gpu.gypi
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/media_nacl.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/media_variables.gypi
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/midi/midi.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/mojo/interfaces/mojo_bindings.gyp
[delete] https://crrev.com/e516887a797e8e8aa71c00cc21a8359b96ede1e7/media/shared_memory_support.gypi

I'll let the ffmpeg change be pulled in with the next deps roll; there's no rush.