events: Update scroll and touch handlers to not return EventResult.

ash/touch/touch_observer_hud.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/touch/touch_observer_hud.h"
 
 #include "ash/shell_window_ids.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/skia/include/core/SkPath.h"
@@ skipping 164 matching lines @@
       break;
     default:
       status = "?";
       break;
   }
   std::string string = base::StringPrintf("%2d: %s %s",
       index, status, touch_positions_[index].ToString().c_str());
   touch_labels_[index]->SetText(UTF8ToUTF16(string));
 }
 
-ui::EventResult TouchObserverHUD::OnTouchEvent(ui::TouchEvent* event) {
+void TouchObserverHUD::OnTouchEvent(ui::TouchEvent* event) {
   if (event->touch_id() >= kMaxTouchPoints)
-    return ui::ER_UNHANDLED;
+    return;
 
   if (event->type() != ui::ET_TOUCH_CANCELLED)
     touch_positions_[event->touch_id()] = event->root_location();
   if (event->type() == ui::ET_TOUCH_PRESSED)
     canvas_->Start(event->touch_id(), touch_positions_[event->touch_id()]);
   else
     canvas_->Update(event->touch_id(), touch_positions_[event->touch_id()]);
   touch_status_[event->touch_id()] = event->type();
   touch_labels_[event->touch_id()]->SetVisible(true);
   UpdateTouchPointLabel(event->touch_id());
 
   widget_->SetSize(widget_->GetContentsView()->GetPreferredSize());
-
-  return ui::ER_UNHANDLED;
 }
 
 void TouchObserverHUD::OnWidgetClosing(views::Widget* widget) {
   DCHECK_EQ(widget, widget_);
   widget_ = NULL;
 }
 
 }  // namespace internal
 }  // namespace ash