events: Change gesture-event handler in EventHandler to not return any values.

ash/wm/workspace/frame_maximize_button.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 "ash/wm/workspace/frame_maximize_button.h"
 
 #include "ash/launcher/launcher.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/wm/maximize_bubble_controller.h"
@@ skipping 227 matching lines @@
   if (!ProcessEndEvent(event) && snap_was_enabled)
     ImageButton::OnMouseReleased(event);
   // At this point |this| might be already destroyed.
 }
 
 void FrameMaximizeButton::OnMouseCaptureLost() {
   Cancel(false);
   ImageButton::OnMouseCaptureLost();
 }
 
-ui::EventResult FrameMaximizeButton::OnGestureEvent(ui::GestureEvent* event) {
+void FrameMaximizeButton::OnGestureEvent(ui::GestureEvent* event) {
   if (event->type() == ui::ET_GESTURE_TAP_DOWN) {
     is_snap_enabled_ = true;
     ProcessStartEvent(*event);
-    return ui::ER_CONSUMED;
+    event->SetHandled();
+    return;
   }
 
   if (event->type() == ui::ET_GESTURE_TAP ||
       event->type() == ui::ET_GESTURE_SCROLL_END) {
     // The position of the event may have changed from the previous event (both
     // for TAP and SCROLL_END). So it is necessary to update the snap-state for
     // the current event.
     ProcessUpdateEvent(*event);
     if (event->type() == ui::ET_GESTURE_TAP)
       snap_type_ = SnapTypeForLocation(event->location());
     ProcessEndEvent(*event);
-    return ui::ER_CONSUMED;
+    event->SetHandled();
+    return;
   }
 
   if (is_snap_enabled_) {
     if (event->type() == ui::ET_GESTURE_END &&
         event->details().touch_points() == 1) {
       // The position of the event may have changed from the previous event. So
       // it is necessary to update the snap-state for the current event.
       ProcessUpdateEvent(*event);
       snap_type_ = SnapTypeForLocation(event->location());
       ProcessEndEvent(*event);
-      return ui::ER_CONSUMED;
+      event->SetHandled();
+      return;
     }
 
     if (event->type() == ui::ET_GESTURE_SCROLL_UPDATE ||
         event->type() == ui::ET_GESTURE_SCROLL_BEGIN) {
       ProcessUpdateEvent(*event);
-      return ui::ER_CONSUMED;
+      event->SetHandled();
+      return;
     }
   }
 
-  return ImageButton::OnGestureEvent(event);
+  ImageButton::OnGestureEvent(event);
 }
 
 void FrameMaximizeButton::ProcessStartEvent(const ui::LocatedEvent& event) {
   DCHECK(is_snap_enabled_);
   // Prepare the help menu.
   if (!maximizer_.get()) {
     maximizer_.reset(new MaximizeBubbleController(
         this,
         GetMaximizeBubbleFrameState(),
         bubble_appearance_delay_ms_));
@@ skipping 258 matching lines @@
     return FRAME_STATE_SNAP_LEFT;
   if (bounds.right() == screen.right())
     return FRAME_STATE_SNAP_RIGHT;
   // If we come here, it is likely caused by the fact that the
   // "VerticalResizeDoubleClick" stored a restore rectangle. In that case
   // we allow all maximize operations (and keep the restore rectangle).
   return FRAME_STATE_NONE;
 }
 
 }  // namespace ash