Revert 199530 "Refactor GpuDataManagerImpl to make it thread-saf..."

Caused browser process crashes on dual-GPU Macs.

> Refactor GpuDataManagerImpl to make it thread-safe, now and forever.
> 
> The original impl of GpuDataManagerImpl is thread-safe, but gradurally it regressed.
> 
> In order to make sure this class is thread-safe in the future, we move all code to GpuDataManagerImplPrivate, and make GpuDataManagerImpl a simple wrapper around GpuDataManagerImplPrivate's public functions, where each function call is guarded by lock, thus thread-safe.
> 
> BUG=232556
> TEST=asan bots no longer crashes as described in crbug.com/232556
> R=joi@chromium.org, kbr@chromium.org, piman@chromium.org
> 
> Review URL: https://codereview.chromium.org/14794006

TBR=zmo@chromium.org

Review URL: https://codereview.chromium.org/15043006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@199770 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 0 insertions, 3 deletions

diff --git a/content/public/browser/gpu_data_manager_observer.h b/content/public/browser/gpu_data_manager_observer.h
index 53989fe..4ed348e 100644
--- a/content/public/browser/gpu_data_manager_observer.h
+++ b/content/public/browser/gpu_data_manager_observer.h
@@ -35,9 +35,6 @@ class GpuDataManagerObserver {
   // Called for any observer when the GPU process crashed.
   virtual void OnGpuProcessCrashed(base::TerminationStatus exit_code) {}
 
-  // Called for any observer when the system switches to a different GPU.
-  virtual void OnGpuSwitching() {}
-
  protected:
   virtual ~GpuDataManagerObserver() {}
 };