Revert of Replacing allocate bitmap IPC messages with a new Mojo interface.

content/common/child_process_messages.h

Index: content/common/child_process_messages.h
diff --git a/content/common/child_process_messages.h b/content/common/child_process_messages.h
index 91733d6db2f18c17d5f25c2079e9a01d8666ee03..cbe6d9b6fdb836a32b56e5ed5f35003d4fa16694 100644
--- a/content/common/child_process_messages.h
+++ b/content/common/child_process_messages.h
@@ -179,6 +179,23 @@
 IPC_MESSAGE_CONTROL0(ChildProcessHostMsg_ReleaseCachedFonts)
 #endif  // defined(OS_WIN)
 
+// Asks the browser to create a block of shared memory for the child process to
+// fill in and pass back to the browser.
+IPC_SYNC_MESSAGE_CONTROL2_1(ChildProcessHostMsg_SyncAllocateSharedBitmap,
+                            uint32_t /* buffer size */,
+                            cc::SharedBitmapId,
+                            base::SharedMemoryHandle)
+
+// Informs the browser that the child allocated a shared bitmap.
+IPC_MESSAGE_CONTROL3(ChildProcessHostMsg_AllocatedSharedBitmap,
+                     uint32_t /* buffer size */,
+                     base::SharedMemoryHandle,
+                     cc::SharedBitmapId)
+
+// Informs the browser that the child deleted a shared bitmap.
+IPC_MESSAGE_CONTROL1(ChildProcessHostMsg_DeletedSharedBitmap,
+                     cc::SharedBitmapId)
+
 // Asks the browser to create a gpu memory buffer.
 IPC_SYNC_MESSAGE_CONTROL5_1(ChildProcessHostMsg_SyncAllocateGpuMemoryBuffer,
                             gfx::GpuMemoryBufferId /* new_id */,