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 c74214a181ac64ef60d1d4b30666f8cc51badce9..b9cd11f77802b20205b76e93ac9537c1bc60a572 100644
--- a/content/common/child_process_messages.h
+++ b/content/common/child_process_messages.h
@@ -180,13 +180,6 @@ IPC_SYNC_MESSAGE_CONTROL1_1(ChildProcessHostMsg_SyncAllocateSharedMemory,
                             uint32_t /* buffer size */,
                             base::SharedMemoryHandle)
 
-// 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 */,