Revert of Mac: Require child AllocateGpuMemoryBuffer to not fail

content/child/child_gpu_memory_buffer_manager.cc

Index: content/child/child_gpu_memory_buffer_manager.cc
diff --git a/content/child/child_gpu_memory_buffer_manager.cc b/content/child/child_gpu_memory_buffer_manager.cc
index 21a512f319453169e1e7632c6b96168355829a53..c83ceea64155878cb1e3e3ae0de17bff2c53f002 100644
--- a/content/child/child_gpu_memory_buffer_manager.cc
+++ b/content/child/child_gpu_memory_buffer_manager.cc
@@ -45,13 +45,18 @@
       content::GetNextGenericSharedMemoryId(), size.width(), size.height(),
       format, usage, &handle);
   bool success = sender_->Send(message);
-  CHECK(success);
-  CHECK(!handle.is_null());
+  if (!success || handle.is_null())
+    return nullptr;
 
   scoped_ptr<GpuMemoryBufferImpl> buffer(GpuMemoryBufferImpl::CreateFromHandle(
       handle, size, format, usage,
       base::Bind(&DeletedGpuMemoryBuffer, sender_, handle.id)));
-  CHECK(buffer);
+  if (!buffer) {
+    sender_->Send(new ChildProcessHostMsg_DeletedGpuMemoryBuffer(
+        handle.id, gpu::SyncToken()));
+    return nullptr;
+  }
+
   return buffer.Pass();
 }