Remove the command buffer method glGetImageivCHROMIUM.
It is no longer necessary, since the browser compositor no longer needs access
to the underlying GpuMemoryBuffers.
This CL is a revert of "Expose GpuMemoryBufferId through glGetImageivCHROMIUM."
> WebKit widgets that provide textures to TextureLayer need to also provide the
> GpuMemoryBufferId if the texture is backed by a GpuMemoryBuffer. This CL
> modifies the CHROMIUM Image extension to allow the GpuMemoryBuffer id to be
> obtained by a new function glGetImageivCHROMIUM.
BUG=608026
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
Review-Url: https://codereview.chromium.org/2134793002
Cr-Commit-Position: refs/heads/master@{#404502}
40 files changed
