events: Update mouse-event handlers to not return EventResult.

content/browser/web_contents/web_contents_view_aura.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/web_contents/web_contents_view_aura.h"
 
 #include "base/auto_reset.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/renderer_host/dip_util.h"
 #include "content/browser/renderer_host/overscroll_controller.h"
@@ skipping 893 matching lines @@
   NOTREACHED();
   return scoped_refptr<ui::Texture>();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsViewAura, ui::EventHandler implementation:
 
 void WebContentsViewAura::OnKeyEvent(ui::KeyEvent* event) {
 }
 
-ui::EventResult WebContentsViewAura::OnMouseEvent(ui::MouseEvent* event) {
+void WebContentsViewAura::OnMouseEvent(ui::MouseEvent* event) {
   if (!web_contents_->GetDelegate())
-    return ui::ER_UNHANDLED;
+    return;
 
   switch (event->type()) {
     case ui::ET_MOUSE_PRESSED:
       web_contents_->GetDelegate()->ActivateContents(web_contents_);
       break;
     case ui::ET_MOUSE_MOVED:
       web_contents_->GetDelegate()->ContentsMouseEvent(
           web_contents_,
           gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
           true);
       break;
     default:
       break;
   }
-  return ui::ER_UNHANDLED;
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // WebContentsViewAura, aura::client::DragDropDelegate implementation:
 
 void WebContentsViewAura::OnDragEntered(const ui::DropTargetEvent& event) {
   if (drag_dest_delegate_)
     drag_dest_delegate_->DragInitialize(web_contents_);
 
   current_drop_data_.reset(new WebDropData());
@@ skipping 53 matching lines @@
       event.location(),
       gfx::Screen::GetScreenFor(GetNativeView())->GetCursorScreenPoint(),
       ConvertAuraEventFlagsToWebInputEventModifiers(event.flags()));
   if (drag_dest_delegate_)
     drag_dest_delegate_->OnDrop();
   current_drop_data_.reset();
   return current_drag_op_;
 }
 
 }  // namespace content