clang: Turn on -Wabsolute-value.

ui/app_list/views/contents_view.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/app_list/views/contents_view.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "ui/app_list/app_list_constants.h"
@@ skipping 285 matching lines @@
   }
 }
 
 void ContentsView::OnScrollEvent(ui::ScrollEvent* event) {
   if (show_state_ != SHOW_APPS ||
       event->type() == ui::ET_SCROLL_FLING_CANCEL) {
     return;
   }
 
   float offset;
-  if (abs(event->x_offset()) > abs(event->y_offset()))
+  if (std::abs(event->x_offset()) > std::abs(event->y_offset()))
     offset = event->x_offset();
   else
     offset = event->y_offset();
 
-  if (abs(offset) > kMinScrollToSwitchPage) {
+  if (std::abs(offset) > kMinScrollToSwitchPage) {
     if (!pagination_model_->has_transition()) {
       pagination_model_->SelectPageRelative(offset > 0 ? -1 : 1,
                                             true);
     }
     event->SetHandled();
     event->StopPropagation();
   }
 }
 
 }  // namespace app_list