Revert of Changed storage used by WrapCVPixelBuffer from UNOWNED_MEMORY to OPAQUE. (patchset #1 id:1 of https://codereview.chromium.org/1332063002/ )
Revert of Changed storage used by WrapCVPixelBuffer from UNOWNED_MEMORY to OPAQUE. (patchset #1 id:1 of https://codereview.chromium.org/1332063002/ )

Reason for revert:
This appears to have broken cast unittests on mac 10.9, eg
[22629:1287:0914/103753:19617281535991:FATAL:video_frame.cc(662)] Check failed: IsMappable().
0   libbase.dylib                       0x0000000112ae036f base::debug::StackTrace::StackTrace() + 47
1   libbase.dylib                       0x0000000112ae03c3 base::debug::StackTrace::StackTrace() + 35
2   libbase.dylib                       0x0000000112b47e50 logging::LogMessage::~LogMessage() + 80
3   libbase.dylib                       0x0000000112b46d83 logging::LogMessage::~LogMessage() + 35
4   libmedia.dylib                      0x000000010fee6adb media::VideoFrame::data(unsigned long) + 443
5   cast_unittests                      0x000000010f07bed3 media::cast::PopulateVideoFrame(media::VideoFrame*, int) + 227
6   cast_unittests                      0x000000010ef2c680 media::cast::VideoEncoderTest::CreateTestVideoFrame(gfx::Size const&) + 400
7   cast_unittests                      0x000000010ef2b3a6 media::cast::VideoEncoderTest_EncodesVariedFrameSizes_Test::TestBody() + 1846
8   cast_unittests                      0x000000010f102408 void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*) + 136

Original issue's description:
> Changed storage used by WrapCVPixelBuffer from UNOWNED_MEMORY to OPAQUE.
>
> This ensures development builds of Google Cast remote display does not
> render the performance overlay since the video frame is unmappable.
>
> OPAQUE is also a more accurate description for CVPixelBuffer than since it is
> unmappable and currently does not have any external data pointers available.
>
> BUG=529376
>
> Committed: https://crrev.com/609c43ba6748e447c8670d57d3cf1eda6915b95e
> Cr-Commit-Position: refs/heads/master@{#348634}

TBR=miu@chromium.org,jfroy@chromium.org,sandersd@chromium.org,lite@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=529376

Review URL: https://codereview.chromium.org/1341053002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#348669}

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