experiment with -Wimplicit-fallthrough

content/browser/renderer_host/render_view_host_impl.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/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 1926 matching lines @@
       break;
     case WebInputEvent::MouseDown:
       delegate_->HandleMouseDown();
       break;
     case WebInputEvent::MouseWheel:
       if (ignore_input_events())
         delegate_->OnIgnoredUIEvent();
       break;
     case WebInputEvent::MouseUp:
       delegate_->HandleMouseUp();
+      break;
     default:
       // For now, we don't care about the rest.
       break;
   }
 }
 
 void RenderViewHostImpl::OnPointerEventActivate() {
   delegate_->HandlePointerActivate();
 }
 
@@ skipping 365 matching lines @@
 void RenderViewHostImpl::AttachToFrameTree() {
   FrameTree* frame_tree = delegate_->GetFrameTree();
 
   frame_tree->ResetForMainFrameSwap();
   if (main_frame_id() != FrameTreeNode::kInvalidFrameId) {
     frame_tree->OnFirstNavigationAfterSwap(main_frame_id());
   }
 }
 
 }  // namespace content