gpu: Some cleanups.

content/public/browser/gpu_data_manager.h

Index: content/public/browser/gpu_data_manager.h
diff --git a/content/public/browser/gpu_data_manager.h b/content/public/browser/gpu_data_manager.h
index ff6f1d9224983f8debea96e2cccd044e657c1114..db341fb80f6f385792a9d39a86e1d29161ce495a 100644
--- a/content/public/browser/gpu_data_manager.h
+++ b/content/public/browser/gpu_data_manager.h
@@ -25,9 +25,6 @@ class GpuDataManagerObserver;
 // This class is fully thread-safe.
 class GpuDataManager {
  public:
-  typedef base::Callback<void(const std::list<base::ProcessHandle>&)>
-      GetGpuProcessHandlesCallback;
-
   // Getter for the singleton.
   CONTENT_EXPORT static GpuDataManager* GetInstance();
 
@@ -40,10 +37,6 @@ class GpuDataManager {
 
   virtual gpu::GPUInfo GetGPUInfo() const = 0;
 
-  // Retrieves a list of process handles for all gpu processes.
-  virtual void GetGpuProcessHandles(
-      const GetGpuProcessHandlesCallback& callback) const = 0;
-
   // This indicator might change because we could collect more GPU info or
   // because the GPU blacklist could be updated.
   // If this returns false, any further GPU access, including launching GPU