Remove unused features for in-process GL contexts.

ui/compositor/test/in_process_context_provider.h

Index: ui/compositor/test/in_process_context_provider.h
diff --git a/ui/compositor/test/in_process_context_provider.h b/ui/compositor/test/in_process_context_provider.h
index b7c85652fe13938ab5c13a588c9ef3fd5392eca2..5e0447c56acc03fde3a6e4b20e271a1a87f93c3f 100644
--- a/ui/compositor/test/in_process_context_provider.h
+++ b/ui/compositor/test/in_process_context_provider.h
@@ -30,6 +30,7 @@ class InProcessContextProvider : public cc::ContextProvider {
  public:
   static scoped_refptr<InProcessContextProvider> Create(
       const gpu::gles2::ContextCreationAttribHelper& attribs,
+      InProcessContextProvider* shared_context,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
       gpu::ImageFactory* image_factory,
       gfx::AcceleratedWidget window,
@@ -38,7 +39,8 @@ class InProcessContextProvider : public cc::ContextProvider {
   // Uses default attributes for creating an offscreen context.
   static scoped_refptr<InProcessContextProvider> CreateOffscreen(
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
-      gpu::ImageFactory* image_factory);
+      gpu::ImageFactory* image_factory,
+      InProcessContextProvider* shared_context);
 
   // cc::ContextProvider:
   bool BindToCurrentThread() override;
@@ -57,14 +59,13 @@ class InProcessContextProvider : public cc::ContextProvider {
  private:
   InProcessContextProvider(
       const gpu::gles2::ContextCreationAttribHelper& attribs,
+      InProcessContextProvider* shared_context,
       gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
       gpu::ImageFactory* image_factory,
       gfx::AcceleratedWidget window,
       const std::string& debug_name);
   ~InProcessContextProvider() override;
 
-  void OnLostContext();
-
   base::ThreadChecker main_thread_checker_;
   base::ThreadChecker context_thread_checker_;
 
@@ -72,14 +73,13 @@ class InProcessContextProvider : public cc::ContextProvider {
   skia::RefPtr<class GrContext> gr_context_;
 
   gpu::gles2::ContextCreationAttribHelper attribs_;
+  InProcessContextProvider* shared_context_;
   gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager_;
   gpu::ImageFactory* image_factory_;
   gfx::AcceleratedWidget window_;
   std::string debug_name_;
   cc::ContextProvider::Capabilities capabilities_;
 
-  LostContextCallback lost_context_callback_;
-
   base::Lock context_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(InProcessContextProvider);