Reduce FOR_EACH_OBSERVER usage in ui/

ui/display/chromeos/x11/native_display_delegate_x11.cc

 // Copyright 2014 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/display/chromeos/x11/native_display_delegate_x11.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 #include <X11/extensions/dpms.h>
 #include <X11/extensions/Xrandr.h>
@@ skipping 72 matching lines @@
   ~HelperDelegateX11() override {}
 
   // NativeDisplayDelegateX11::HelperDelegate overrides:
   void UpdateXRandRConfiguration(const base::NativeEvent& event) override {
     XRRUpdateConfiguration(event);
   }
   const std::vector<DisplaySnapshot*>& GetCachedDisplays() const override {
     return delegate_->cached_outputs_.get();
   }
   void NotifyDisplayObservers() override {
-    FOR_EACH_OBSERVER(
-        NativeDisplayObserver, delegate_->observers_, OnConfigurationChanged());
+    for (NativeDisplayObserver& observer : delegate_->observers_)
+      observer.OnConfigurationChanged();
   }
 
  private:
   NativeDisplayDelegateX11* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(HelperDelegateX11);
 };
 
 ////////////////////////////////////////////////////////////////////////////////
 // NativeDisplayDelegateX11 implementation:
@@ skipping 550 matching lines @@
   XSetForeground(display_, gc, color.pixel);
   XSetFillStyle(display_, gc, FillSolid);
   int width = DisplayWidth(display_, DefaultScreen(display_));
   int height = DisplayHeight(display_, DefaultScreen(display_));
   XFillRectangle(display_, window_, gc, 0, 0, width, height);
   XFreeGC(display_, gc);
   XFreeColors(display_, colormap, &color.pixel, 1, 0);
 }
 
 }  // namespace ui