Remove canScroll from WebMouseWheelEvent as it is unused now.

content/renderer/input/render_widget_input_handler.cc

 // Copyright 2015 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/renderer/input/render_widget_input_handler.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 369 matching lines @@
     for (size_t i = 0; i < touch_event.touchesLength; ++i) {
       if (touch_event.touches[i].state == WebTouchPoint::StatePressed &&
           delegate_->HasTouchEventHandlersAt(
               gfx::ToFlooredPoint(touch_event.touches[i].position))) {
         ack_result = INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
         break;
       }
     }
   }
 
   // Send mouse wheel events and their disposition to the compositor thread, so

[tdresser, 2016/06/10 18:06:46]

Update comment - not longer mouse wheel events.

nit: Let's pluralized disposition, while we're here.

[dtapuska, 2016/06/10 19:11:17]

Done.

   // that they can be used to produce the elastic overscroll effect on Mac.
-  if (input_event.type == WebInputEvent::MouseWheel) {
-    const WebMouseWheelEvent& wheel_event =
-        static_cast<const WebMouseWheelEvent&>(input_event);
-    if (wheel_event.canScroll) {
-      delegate_->ObserveWheelEventAndResult(
-          wheel_event,
-          event_overscroll ? event_overscroll->latest_overscroll_delta
-                           : gfx::Vector2dF(),
-          processed != WebInputEventResult::NotHandled);
-    }
-  } else if (input_event.type == WebInputEvent::GestureScrollBegin ||
-             input_event.type == WebInputEvent::GestureScrollEnd ||
-             input_event.type == WebInputEvent::GestureScrollUpdate) {
+  if (input_event.type == WebInputEvent::GestureScrollBegin ||
+      input_event.type == WebInputEvent::GestureScrollEnd ||
+      input_event.type == WebInputEvent::GestureScrollUpdate) {
     const WebGestureEvent& gesture_event =
         static_cast<const WebGestureEvent&>(input_event);
     if (gesture_event.sourceDevice == blink::WebGestureDeviceTouchpad) {
       delegate_->ObserveGestureEventAndResult(
           gesture_event,
           event_overscroll ? event_overscroll->latest_overscroll_delta
                            : gfx::Vector2dF(),
           processed != WebInputEventResult::NotHandled);
     }
   }
@@ skipping 150 matching lines @@
   if (pending_input_event_ack_) {
     TRACE_EVENT_ASYNC_END0("input",
                            "RenderWidgetInputHandler::ThrottledInputEventAck",
                            pending_input_event_ack_.get());
     delegate_->OnInputEventAck(std::move(pending_input_event_ack_));
   }
   total_input_handling_time_this_frame_ = base::TimeDelta();
 }
 
 }  // namespace content