Revert of Fix an issue that audio and video may run out of sync

Revert of Fix an issue that audio and video may run out of sync (https://codereview.chromium.org/215783002/)

Reason for revert:
Android Tests failed
http://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/13105



Note: Google Test filter = MediaSourcePlayerTest.CurrentTimeUpdatedWhileDecoderStarved
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from MediaSourcePlayerTest
[ RUN      ] MediaSourcePlayerTest.CurrentTimeUpdatedWhileDecoderStarved
../../media/base/android/media_source_player_unittest.cc:2088: Failure
Expected: (current_time.InMillisecondsF()) < (player_.GetCurrentTime().InMillisecondsF()), actual: 0 vs 0
[  FAILED  ] MediaSourcePlayerTest.CurrentTimeUpdatedWhileDecoderStarved (305 ms)
[----------] 1 test from MediaSourcePlayerTest (305 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (307 ms total)
[  PASSED  ] 0 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] MediaSourcePlayerTest.CurrentTimeUpdatedWhileDecoderStarved

Original issue's description:
> Fix an issue that audio and video may run out of sync
> 
> This CL fixes 3 issues:
> 1. In ProcessPendingEvents(), if there is a non-seek pending event, UpdateTimestamps() will not get called.
>  This is probably the number 1 reason that a/v lose sync.
> 2. MSP use its internal clock to estimate the current presentation time. 
> However, hardware may consume data at a different rate. 
> Passing the current frame position from AudioTrack to MSP so we get a better estimation of the current time.
> 3. When config change comes, We don't need to reset the clock if audio decoder is not recreated.
> 
> BUG=351722
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=263754

TBR=wolenetz@chromium.org,igsolla@chromium.org,acolwell@chromium.org,qinmin@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=351722
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=263795

[horo, 2014-04-15 05:45:49]

Created Revert of Fix an issue that audio and video may run out of sync

[commit-bot: I haz the power, 2014-04-15 05:47:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/horo@chromium.org/238053004/1

[commit-bot: I haz the power, 2014-04-15 05:49:49]

Change committed as 263795