Delete some unused code found by -Wunused-function

content/browser/gpu/gpu_process_host.cc

Index: content/browser/gpu/gpu_process_host.cc
diff --git a/content/browser/gpu/gpu_process_host.cc b/content/browser/gpu/gpu_process_host.cc
index b074f062c4584357a71da7c968449db014202f7b..481be2d271fca8d8b50d4eb56b53804bb7e17210 100644
--- a/content/browser/gpu/gpu_process_host.cc
+++ b/content/browser/gpu/gpu_process_host.cc
@@ -125,6 +125,7 @@ void AcceleratedSurfaceBuffersSwappedCompletedForGPU(int host_id,
   }
 }
 
+#if defined(OS_WIN)
 // This sends a ViewMsg_SwapBuffers_ACK directly to the renderer process
 // (RenderWidget). This path is currently not used with the threaded compositor.
 void AcceleratedSurfaceBuffersSwappedCompletedForRenderer(
@@ -167,6 +168,7 @@ void AcceleratedSurfaceBuffersSwappedCompleted(int host_id,
   AcceleratedSurfaceBuffersSwappedCompletedForRenderer(surface_id, timebase,
                                                        interval);
 }
+#endif  // defined(OS_WIN)
 
 }  // anonymous namespace
 
@@ -663,7 +665,6 @@ void GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped(
 #endif  // OS_MACOSX
 
 #if defined(OS_WIN)
-
 void GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped(
     const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params) {
   TRACE_EVENT0("gpu", "GpuProcessHost::OnAcceleratedSurfaceBuffersSwapped");