Cleanup: Remove unused GetOuterRenderWidgetHostForKeyboardInput()

RenderFrameHostManager::GetOuterRenderWidgetHostForKeyboardInput() is no
more used. Remove it.

Bug: None.
Change-Id: I552ae9a4f54370463bc44919ad4064229e65d8f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626413Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663147}

content/browser/frame_host/render_frame_host_manager.cc

@@ -181,20 +181,6 @@ bool RenderFrameHostManager::IsMainFrameForInnerDelegate() {
              FrameTreeNode::kFrameTreeNodeInvalidId;
 }
 
-RenderWidgetHostImpl*
-RenderFrameHostManager::GetOuterRenderWidgetHostForKeyboardInput() {
-  if (!IsMainFrameForInnerDelegate())
-    return nullptr;
-
-  FrameTreeNode* outer_contents_frame_tree_node =
-      FrameTreeNode::GloballyFindByID(
-          delegate_->GetOuterDelegateFrameTreeNodeId());
-  return outer_contents_frame_tree_node->parent()
-      ->current_frame_host()
-      ->render_view_host()
-      ->GetWidget();
-}
-
 FrameTreeNode* RenderFrameHostManager::GetOuterDelegateNode() {
   int outer_contents_frame_tree_node_id =
       delegate_->GetOuterDelegateFrameTreeNodeId();

content/browser/frame_host/render_frame_host_manager.h

@@ -207,12 +207,6 @@ class CONTENT_EXPORT RenderFrameHostManager
   // that belongs to an inner WebContents.
   bool IsMainFrameForInnerDelegate();
 
-  // Returns the RenderWidgetHost of the outer WebContents (if any) that can be
-  // used to fetch the last keyboard event.
-  // TODO(lazyboy): This can be removed once input events are sent directly to
-  // remote frames.
-  RenderWidgetHostImpl* GetOuterRenderWidgetHostForKeyboardInput();
-
   // If this is a RenderFrameHostManager for a main frame, this method returns
   // the FrameTreeNode for the frame in the outer WebContents (if any) that
   // contains the inner WebContents.