Revert of Add command_buffer_gles2 (patchset #14 id:310001 of https://codereview...

Revert of Add command_buffer_gles2 (patchset #14 id:310001 of https://codereview.chromium.org/1220883008/ )

Reason for revert:
Doesn't build on 64-bit Windows gn:

http://build.chromium.org/p/chromium.fyi/builders/CrWinClang64%28dbg%29/builds/1743

FAILED: C:/b/depot_tools/python276_bin/python.exe gyp-win-tool link-wrapper environment.x64 False link.exe /nologo /IMPLIB:./command_buffer_gles2.dll.lib /DLL /OUT:./command_buffer_gles2.dll /PDB:./command_buffer_gles2.dll.pdb @./command_buffer_gles2.dll.rsp
gpu.dll.lib(gpu.dll) :error LNK2005: "public: __cdecl gpu::gles2::GLES2CmdHelper::GLES2CmdHelper(class gpu::CommandBuffer *)" (??0GLES2CmdHelper@gles2@gpu@@QEAA@PEAVCommandBuffer@2@@Z) already defined in gles2_cmd_helper.obj

gpu.dll.lib(gpu.dll) :error LNK2005: "public: bool __cdecl gpu::CommandBufferHelper::Initialize(int)" (?Initialize@CommandBufferHelper@gpu@@QEAA_NH@Z) already defined in cmd_buffer_helper.obj

gpu.dll.lib(gpu.dll) :error LNK2005: "public: __cdecl gpu::TransferBuffer::TransferBuffer(class gpu::CommandBufferHelper *)" (??0TransferBuffer@gpu@@QEAA@PEAVCommandBufferHelper@1@@Z) already defined in transfer_buffer.obj

gpu.dll.lib(gpu.dll) :error LNK2005: "public: void __cdecl base::RefCounted<class gpu::ValueStateMap>::Release(void)const " (?Release@?$RefCounted@VValueStateMap@gpu@@@base@@QEBAXXZ) already defined in value_state.obj

gpu.dll.lib(gpu.dll) :error LNK2005: "public: void __cdecl base::RefCounted<class gpu::ValueStateMap>::AddRef(void)const " (?AddRef@?$RefCounted@VValueStateMap@gpu@@@base@@QEBAXXZ) already defined in value_state.obj

Original issue's description:
> Add command_buffer_gles2
>
> This is a very simple library that exposes some egl-like functions that
> can be used by skia to use the command buffer as a backend for their
> tests
>
> Committed: https://crrev.com/604b615373e4e9f873db37cef9c6416176fc35f3
> Cr-Commit-Position: refs/heads/master@{#346251}
>
> Committed: https://crrev.com/efa3a446183fbbff2034a03989f12543d0713e39
> Cr-Commit-Position: refs/heads/master@{#346840}
>
> Committed: https://crrev.com/d65c55dac3f47e9a237579eb6f5fe31e19ca4704
> Cr-Commit-Position: refs/heads/master@{#347013}

TBR=piman@chromium.org,dpranke@chromium.org,sievers@chromium.org,hendrikw@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1318933006

Cr-Commit-Position: refs/heads/master@{#347069}