Revert of Extract state management from WebMediaPlayerImpl.

Revert of Extract state management from WebMediaPlayerImpl. (patchset #32 id:620001 of https://codereview.chromium.org/1641423002/ )

Reason for revert:
Causes a pair of layout test failures on linux(dbg), https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20%28dbg%29/builds/6332

It _might_ also be behind the MSan failures https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Linux%20MSAN/builds/8850 , but not locally confirmed.

Original issue's description:
> Extract state management from WebMediaPlayerImpl.
> 
> WMPI recieves operations at any time but is backed by Pipeline which can
> only perform one operation at a time. This CL creates a helper class
> (PipelineController) to translate between the two so that WMPI does not need
> to handle the full cross product of states.
> 
> Committed: https://crrev.com/aafb73c6460349c508a49e6e6de21e774ec80b5c
> Cr-Commit-Position: refs/heads/master@{#379168}

TBR=dalecurtis@chromium.org,wolenetz@chromium.org,xhwang@chromium.org,sandersd@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

[sof, 2016-03-04 07:57:54]

Created Revert of Extract state management from WebMediaPlayerImpl.

[commit-bot: I haz the power, 2016-03-04 07:58:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1762963002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1762963002/1

[commit-bot: I haz the power, 2016-03-04 07:58:33]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-03-04 07:58:35]

Failed to apply patch for media/media.gyp:
While running git apply --index -3 -p1;
  error: patch failed: media/media.gyp:536
  error: repository lacks the necessary blob to fall back on 3-way merge.
  error: media/media.gyp: patch does not apply

Patch:       media/media.gyp
Index: media/media.gyp
diff --git a/media/media.gyp b/media/media.gyp
index
d2cc2a93eea889c5c0e66b547dfc9b0e6e341646..a2b05a0e0aafd5119454713e757e7b021774d4ec
100644
--- a/media/media.gyp
+++ b/media/media.gyp
@@ -536,8 +536,6 @@
         'filters/opus_audio_decoder.h',
         'filters/opus_constants.cc',
         'filters/opus_constants.h',
-        'filters/pipeline_controller.cc',
-        'filters/pipeline_controller.h',
         'filters/source_buffer_range.cc',
         'filters/source_buffer_range.h',
         'filters/source_buffer_stream.cc',
@@ -1260,7 +1258,6 @@
         'filters/ivf_parser_unittest.cc',
         'filters/jpeg_parser_unittest.cc',
         'filters/memory_data_source_unittest.cc',
-        'filters/pipeline_controller_unittest.cc',
         'filters/source_buffer_stream_unittest.cc',
         'filters/video_cadence_estimator_unittest.cc',
         'filters/video_decoder_selector_unittest.cc',