Revert of Android: Start up GPU channel early (patchset #1 id:1 of...

Revert of Android: Start up GPU channel early (patchset #1 id:1 of https://codereview.chromium.org/893393004/)

Reason for revert:
Speculative revert to see if this could be the cause of crbug.com/456835.

Original issue's description:
> Android: Start up GPU channel early
>
> This addresses a TODO and reverts
> https://codereview.chromium.org/777303004.
>
> With https://codereview.chromium.org/889083002
> the CrashDumpManager is now initialized earlier so
> things should be fine.
>
> BUG=439322
>
> Committed: https://crrev.com/b8be6ae0e26843eab92ac1527a752278fec65d99
> Cr-Commit-Position: refs/heads/master@{#315170}

TBR=cjhopman@chromium.org,sievers@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=439322

Review URL: https://codereview.chromium.org/910433004

Cr-Commit-Position: refs/heads/master@{#315305}

content/browser/browser_main_loop.cc

@@ -1077,7 +1077,8 @@ int BrowserMainLoop::BrowserThreadsStarted() {
   }
 #endif
 #elif defined(OS_ANDROID)
-  established_gpu_channel = true;
+  // TODO(crbug.com/439322): This should be set to |true|.
+  established_gpu_channel = false;
   BrowserGpuChannelHostFactory::Initialize(established_gpu_channel);
 #endif