Make SharedMemoryHandle a class on windows.

content/gpu/gpu_child_thread.cc

Index: content/gpu/gpu_child_thread.cc
diff --git a/content/gpu/gpu_child_thread.cc b/content/gpu/gpu_child_thread.cc
index c6c1e3137bd79e7b03e39f3a5f019c5d6ce3e3f4..e40928cd82a696d4dc88f320beac678296625d1a 100644
--- a/content/gpu/gpu_child_thread.cc
+++ b/content/gpu/gpu_child_thread.cc
@@ -257,12 +257,12 @@ void GpuChildThread::OnInitialize() {
   // Defer creation of the render thread. This is to prevent it from handling
   // IPC messages before the sandbox has been enabled and all other necessary
   // initialization has succeeded.
-  gpu_channel_manager_.reset(new GpuChannelManager(
-      channel(), watchdog_thread_.get(),
-      base::ThreadTaskRunnerHandle::Get().get(),
-      ChildProcess::current()->io_task_runner(),
-      ChildProcess::current()->GetShutDownEvent(),
-      sync_point_manager_, gpu_memory_buffer_factory_));
+  gpu_channel_manager_.reset(
+      new GpuChannelManager(channel(), watchdog_thread_.get(),
+                            base::ThreadTaskRunnerHandle::Get().get(),
+                            ChildProcess::current()->io_task_runner(),
+                            ChildProcess::current()->GetShutDownEvent(),
+                            sync_point_manager_, gpu_memory_buffer_factory_));
 
 #if defined(USE_OZONE)
   ui::OzonePlatform::GetInstance()