clang: Turn on -Wabsolute-value.

ui/app_list/views/contents_view.cc

Index: ui/app_list/views/contents_view.cc
diff --git a/ui/app_list/views/contents_view.cc b/ui/app_list/views/contents_view.cc
index ed79a7a29eb6160bf2e3bd48e6afa4576b9d39d2..9dff72d22a34a2ff85d18768ac6cd55b4459f2f5 100644
--- a/ui/app_list/views/contents_view.cc
+++ b/ui/app_list/views/contents_view.cc
@@ -303,12 +303,12 @@ void ContentsView::OnScrollEvent(ui::ScrollEvent* event) {
   }
 
   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);