Remove renderer-to-renderer input event forwarding for OOPIFs

content/common/frame_messages.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // IPC messages for interacting with frames.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1376 matching lines @@
 // value of the frame's beforeunload handler: true if the user decided to
 // proceed with leaving the page.
 IPC_MESSAGE_ROUTED3(FrameHostMsg_BeforeUnload_ACK,
                     bool /* proceed */,
                     base::TimeTicks /* before_unload_start_time */,
                     base::TimeTicks /* before_unload_end_time */)
 
 // Indicates that the current frame has swapped out, after a SwapOut message.
 IPC_MESSAGE_ROUTED0(FrameHostMsg_SwapOut_ACK)
 
-// Forwards an input event to a child.
-// TODO(nick): Temporary bridge, revisit once the browser process can route
-// input directly to subframes. http://crbug.com/339659
-IPC_MESSAGE_ROUTED1(FrameHostMsg_ForwardInputEvent,
-                    IPC::WebInputEventPointer /* event */)
-
 // Tells the parent that a child's frame rect has changed (or the rect/scroll
 // position of a child's ancestor has changed).
 IPC_MESSAGE_ROUTED1(FrameHostMsg_FrameRectChanged, gfx::Rect /* frame_rect */)
 
 // Sent by a parent frame to update its child's viewport intersection rect for
 // use by the IntersectionObserver API.
 IPC_MESSAGE_ROUTED1(FrameHostMsg_UpdateViewportIntersection,
                     gfx::Rect /* viewport_intersection */)
 
 // Informs the child that the frame has changed visibility.
@@ skipping 237 matching lines @@
                     int /* nfr_request_id */,
                     float /* distance */)
 
 IPC_MESSAGE_ROUTED0(FrameHostMsg_NavigationHandledByEmbedder)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent FrameMsg, then ifdefs for platform specific FrameMsg, then
 // platform independent FrameHostMsg, then ifdefs for platform specific
 // FrameHostMsg.