gpu: Remove map_image field from gpu::Capabilities.

ppapi/proxy/ppapi_command_buffer_proxy.cc

Index: ppapi/proxy/ppapi_command_buffer_proxy.cc
diff --git a/ppapi/proxy/ppapi_command_buffer_proxy.cc b/ppapi/proxy/ppapi_command_buffer_proxy.cc
index 81bc44234c3fd67a74c190c0cb0ff97d92a08118..def73315d9ef3b4652ee2036fa9e82de10e90839 100644
--- a/ppapi/proxy/ppapi_command_buffer_proxy.cc
+++ b/ppapi/proxy/ppapi_command_buffer_proxy.cc
@@ -244,12 +244,6 @@ void PpapiCommandBufferProxy::SendManagedMemoryStats(
   NOTREACHED();
 }
 
-gpu::Capabilities PpapiCommandBufferProxy::GetCapabilities() {
-  // TODO(boliu): Need to implement this to use cc in Pepper. Tracked in
-  // crbug.com/325391.
-  return gpu::Capabilities();
-}
-
 gfx::GpuMemoryBuffer* PpapiCommandBufferProxy::CreateGpuMemoryBuffer(
     size_t width,
     size_t height,