Update from chromium https://crrev.com/301725/

gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc

Index: gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
diff --git a/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc b/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
index 1e4066f33145aa1c5cb0cd765fd6642178e32155..34e3a3702bf18d4f1839099ad2c3188a8537183d 100644
--- a/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
+++ b/gpu/command_buffer/service/async_pixel_transfer_manager_egl.cc
@@ -93,11 +93,9 @@ class TransferThread : public base::Thread {
     SetPriority(base::kThreadPriority_Background);
 #endif
   }
-  virtual ~TransferThread() {
-    Stop();
-  }
+  ~TransferThread() override { Stop(); }
 
-  virtual void Init() override {
+  void Init() override {
     gfx::GLShareGroup* share_group = NULL;
     surface_ = new gfx::PbufferGLSurfaceEGL(gfx::Size(1, 1));
     surface_->Initialize();
@@ -107,7 +105,7 @@ class TransferThread : public base::Thread {
     DCHECK(is_current);
   }
 
-  virtual void CleanUp() override {
+  void CleanUp() override {
     surface_ = NULL;
     context_->ReleaseCurrent(surface_.get());
     context_ = NULL;
@@ -401,20 +399,18 @@ class AsyncPixelTransferDelegateEGL
       AsyncPixelTransferManagerEGL::SharedState* shared_state,
       GLuint texture_id,
       const AsyncTexImage2DParams& define_params);
-  virtual ~AsyncPixelTransferDelegateEGL();
+  ~AsyncPixelTransferDelegateEGL() override;
 
   void BindTransfer() { state_->BindTransfer(); }
 
   // Implement AsyncPixelTransferDelegate:
-  virtual void AsyncTexImage2D(
-      const AsyncTexImage2DParams& tex_params,
-      const AsyncMemoryParams& mem_params,
-      const base::Closure& bind_callback) override;
-  virtual void AsyncTexSubImage2D(
-      const AsyncTexSubImage2DParams& tex_params,
-      const AsyncMemoryParams& mem_params) override;
-  virtual bool TransferIsInProgress() override;
-  virtual void WaitForTransferCompletion() override;
+  void AsyncTexImage2D(const AsyncTexImage2DParams& tex_params,
+                       const AsyncMemoryParams& mem_params,
+                       const base::Closure& bind_callback) override;
+  void AsyncTexSubImage2D(const AsyncTexSubImage2DParams& tex_params,
+                          const AsyncMemoryParams& mem_params) override;
+  bool TransferIsInProgress() override;
+  void WaitForTransferCompletion() override;
 
  private:
   // Returns true if a work-around was used.