Revert of Allow WebGL on Android if the GPU has it's own process

Revert of Allow WebGL on Android if the GPU has it's own process (patchset #6 id:100001 of https://codereview.chromium.org/1247093006/)

Reason for revert:
Change suspected to have caused the Android builders to start failing the following tests:

WebglConformance.conformance_attribs_gl_enable_vertex_attrib
WebglConformance.conformance_attribs_gl_vertex_attrib
WebglConformance.conformance_attribs_gl_vertexattribpointer
WebglConformance.conformance_attribs_gl_vertexattribpointer_offsets
WebglConformance.conformance_attribs_gl_vertex_attrib_zero_issues
WebglConformance.conformance_buffers_buffer_bind_test
WebglConformance.conformance_buffers_buffer_data_array_buffer
WebglConformance.conformance_buffers_index_validation_copies_indices
WebglConformance.conformance_buffers_index_validation_crash_with_buffer_sub_data
WebglConformance.conformance_buffers_index_validation_verifies_too_many_indices
WebglConformance.conformance_buffers_index_validation_with_resized_buffer

See build logs:
https://build.chromium.org/p/chromium.gpu/builders/Android%20Debug%20%28Nexus%205%29/builds/1179
https://build.chromium.org/p/chromium.gpu/builders/Android%20Debug%20%28Nexus%206%29/builds/1475
https://build.chromium.org/p/chromium.gpu/builders/Android%20Debug%20%28Nexus%209%29/builds/1306

Original issue's description:
> Allow WebGL on Android if the GPU has it's own process
>
> BUG=512992
>
> Committed: https://crrev.com/29443deeb43de94ed4c8cd38329f1527e4641d03
> Cr-Commit-Position: refs/heads/master@{#340198}

TBR=aelias@chromium.org,kbr@chromium.org,mkwst@chromium.org,zmo@chromium.org,bajones@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=512992
Committed: https://crrev.com/5633c8de60635e8d4ed17aee1dd3186a0375a4df
Cr-Commit-Position: refs/heads/master@{#340244}

[alancutter (OOO until 2018), 2015-07-24 09:40:31]

Created Revert of Allow WebGL on Android if the GPU has it's own process

[commit-bot: I haz the power, 2015-07-24 09:41:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1252293002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1252293002/1

[commit-bot: I haz the power, 2015-07-24 09:42:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-24 09:42:55]

Patchset 1 (id:??) landed as
https://crrev.com/5633c8de60635e8d4ed17aee1dd3186a0375a4df
Cr-Commit-Position: refs/heads/master@{#340244}