Remove dead code in RenderWidgetHostInputEventRouter.

This code no longer appears to be touched at all. Removing
it will reduce the complexity of FindMouseEventTarget, and
facilitate removing the similarly dead code path associated
with BrowserPluginMsg_SetTooltipText.

Bug: 533069
Change-Id: I25927f17268e25d39edbe6586dfc37bae959eb7c
Reviewed-on: https://chromium-review.googlesource.com/894422Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533324}

content/browser/renderer_host/render_widget_host_input_event_router.cc

@@ -209,27 +209,6 @@ RenderWidgetTargetResult RenderWidgetHostInputEventRouter::FindMouseEventTarget(
     needs_transform_point = false;
   }
 
-  if (target && target->IsRenderWidgetHostViewGuest()) {
-    RenderWidgetHostViewBase* owner_view =
-        static_cast<RenderWidgetHostViewGuest*>(target)
-            ->GetOwnerRenderWidgetHostView();
-    // In case there is nested RenderWidgetHostViewGuests (i.e., PDF inside
-    // <webview>), we will need the owner view of the top-most guest for input
-    // routing.
-    while (owner_view->IsRenderWidgetHostViewGuest()) {
-      owner_view = static_cast<RenderWidgetHostViewGuest*>(owner_view)
-                       ->GetOwnerRenderWidgetHostView();
-    }
-
-    if (owner_view != root_view) {
-      needs_transform_point = true;
-    } else {
-      needs_transform_point = false;
-      transformed_point = event.PositionInWidget();
-    }
-    target = owner_view;
-  }
-
   if (needs_transform_point) {
     if (!root_view->TransformPointToCoordSpaceForView(
             event.PositionInWidget(), target, &transformed_point)) {