Remove the assumption about client_id from gpu memory buffer allocation on the browser side.

content/common/gpu/client/gpu_memory_buffer_impl_mac.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_mac.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_mac.cc b/content/common/gpu/client/gpu_memory_buffer_impl_mac.cc
index 6d2e7b63805446d9ec5b3fc38352dd59e14b987f..09aa569d711dc472fecfd88c336f32bad1abbe4e 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_mac.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_mac.cc
@@ -13,6 +13,7 @@ namespace content {
 void GpuMemoryBufferImpl::Create(const gfx::Size& size,
                                  unsigned internalformat,
                                  unsigned usage,
+                                 int gpu_client_id,
                                  const CreationCallback& callback) {
   if (GpuMemoryBufferImplSharedMemory::IsConfigurationSupported(
           size, internalformat, usage)) {