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

ui/views/controls/slider.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 "ui/views/controls/slider.h"
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
@@ skipping 273 matching lines @@
       SetValueInternal(value_ - keyboard_increment_, VALUE_CHANGED_BY_USER);
       return true;
     } else if (event.key_code() == ui::VKEY_UP) {
       SetValueInternal(value_ + keyboard_increment_, VALUE_CHANGED_BY_USER);
       return true;
     }
   }
   return false;
 }
 
-ui::EventResult Slider::OnGestureEvent(ui::GestureEvent* event) {
+void Slider::OnGestureEvent(ui::GestureEvent* event) {
   if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN ||
       event->type() == ui::ET_GESTURE_TAP_DOWN) {
     PrepareForMove(event->location());
     MoveButtonTo(event->location());
-    return ui::ER_CONSUMED;
-  } else
-  if (event->type() == ui::ET_GESTURE_SCROLL_UPDATE ||
-      event->type() == ui::ET_GESTURE_SCROLL_END) {
+    event->SetHandled();
+  } else if (event->type() == ui::ET_GESTURE_SCROLL_UPDATE ||
+             event->type() == ui::ET_GESTURE_SCROLL_END) {
     MoveButtonTo(event->location());
-    return ui::ER_CONSUMED;
+    event->SetHandled();
   }
-  return ui::ER_UNHANDLED;
 }
 
 void Slider::AnimationProgressed(const ui::Animation* animation) {
   animating_value_ = animation->CurrentValueBetween(animating_value_, value_);
   SchedulePaint();
 }
 
 void Slider::GetAccessibleState(ui::AccessibleViewState* state) {
   state->role = ui::AccessibilityTypes::ROLE_SLIDER;
   state->name = accessible_name_;
   state->value = UTF8ToUTF16(
       base::StringPrintf("%d%%", (int)(value_ * 100 + 0.5)));
 }
 
 void Slider::OnPaintFocusBorder(gfx::Canvas* canvas) {
   if (!focus_border_color_) {
     View::OnPaintFocusBorder(canvas);
   } else if (HasFocus() && (focusable() || IsAccessibilityFocusable())) {
     canvas->DrawRect(gfx::Rect(1, 1, width() - 3, height() - 3),
                      focus_border_color_);
   }
 }
 
 }  // namespace views