gpu: Have GpuService create and own GpuMemoryBufferFactory.

services/ui/gpu/gpu_service.h

Index: services/ui/gpu/gpu_service.h
diff --git a/services/ui/gpu/gpu_service.h b/services/ui/gpu/gpu_service.h
index 63ad9b73f589d9c275320cda16836111462776e8..2e8a3f8878c136d7ed5b4a3fa0d4261b758649af 100644
--- a/services/ui/gpu/gpu_service.h
+++ b/services/ui/gpu/gpu_service.h
@@ -47,7 +47,6 @@ class GpuService : public gpu::GpuChannelManagerDelegate,
  public:
   GpuService(const gpu::GPUInfo& gpu_info,
              std::unique_ptr<gpu::GpuWatchdogThread> watchdog,
-             gpu::GpuMemoryBufferFactory* memory_buffer_factory,
              scoped_refptr<base::SingleThreadTaskRunner> io_runner,
              const gpu::GpuFeatureInfo& gpu_feature_info);
 
@@ -69,6 +68,8 @@ class GpuService : public gpu::GpuChannelManagerDelegate,
     return gpu_channel_manager_.get();
   }
 
+  gpu::ImageFactory* gpu_image_factory();
+
   gpu::GpuWatchdogThread* watchdog_thread() { return watchdog_thread_.get(); }
 
   const gpu::GpuFeatureInfo& gpu_feature_info() const {
@@ -158,7 +159,7 @@ class GpuService : public gpu::GpuChannelManagerDelegate,
 
   std::unique_ptr<gpu::GpuWatchdogThread> watchdog_thread_;
 
-  gpu::GpuMemoryBufferFactory* gpu_memory_buffer_factory_;
+  std::unique_ptr<gpu::GpuMemoryBufferFactory> gpu_memory_buffer_factory_;
 
   gpu::GpuPreferences gpu_preferences_;