Fix build issue in Debug mode

ui/events/blink/input_handler_proxy.cc

 // 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.
 
 #include "ui/events/blink/input_handler_proxy.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 583 matching lines @@
       gesture_event.data.scrollUpdate.deltaUnits ==
           blink::WebGestureEvent::ScrollUnits::Pixels) {
     switch (input_handler_->ScrollAnimated(scroll_point, scroll_delta).thread) {
       case cc::InputHandler::SCROLL_ON_IMPL_THREAD:
         return DID_HANDLE;
       case cc::InputHandler::SCROLL_IGNORED:
         return DROP_EVENT;
       default:
         return DID_NOT_HANDLE;
     }
   } else {

[tdresser, 2016/01/25 13:10:23]

Just remove the "else {" here, instead.

[william.xie, 2016/01/26 00:57:09]

Done.

     cc::InputHandlerScrollResult scroll_result =
         input_handler_->ScrollBy(&scroll_state);
     HandleOverscroll(scroll_point, scroll_result);
     return scroll_result.did_scroll ? DID_HANDLE : DROP_EVENT;
   }
+  return DID_NOT_HANDLE;
 }
 
 InputHandlerProxy::EventDisposition InputHandlerProxy::HandleGestureScrollEnd(
   const WebGestureEvent& gesture_event) {
 #ifndef NDEBUG
   DCHECK(expect_scroll_update_end_);
   expect_scroll_update_end_ = false;
 #endif
   cc::ScrollState scroll_state = CreateScrollStateForGesture(gesture_event);
   input_handler_->ScrollEnd(&scroll_state);
@@ skipping 550 matching lines @@
   // trigger a scroll, e.g., with a trivial time delta between fling updates.
   // Return true in this case to prevent early fling termination.
   if (std::abs(clipped_increment.width) < kScrollEpsilon &&
       std::abs(clipped_increment.height) < kScrollEpsilon)
     return true;
 
   return did_scroll;
 }
 
 }  // namespace ui