Make RenderObject::style() return a const object

Source/core/rendering/RenderMediaControls.cpp

 /*
  * Copyright (C) 2009 Apple Inc.
  * Copyright (C) 2009 Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 181 matching lines @@
 }
 
 const int mediaSliderThumbWidth = 32;
 
 static bool paintMediaSlider(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
 {
     HTMLMediaElement* mediaElement = toParentMediaElement(object);
     if (!mediaElement)
         return false;
 
-    RenderStyle* style = object->style();
+    const RenderStyle* style = object->style();
     GraphicsContext* context = paintInfo.context;
 
     paintRoundedSliderBackground(rect, style, context);
 
     // Draw the buffered range. Since the element may have multiple buffered ranges and it'd be
     // distracting/'busy' to show all of them, show only the buffered range containing the current play head.
     RefPtrWillBeRawPtr<TimeRanges> bufferedTimeRanges = mediaElement->buffered();
     float duration = mediaElement->duration();
     float currentTime = mediaElement->currentTime();
     if (std::isnan(duration) || std::isinf(duration) || !duration || std::isnan(currentTime))
@@ skipping 50 matching lines @@
 
 const int mediaVolumeSliderThumbWidth = 24;
 
 static bool paintMediaVolumeSlider(RenderObject* object, const PaintInfo& paintInfo, const IntRect& rect)
 {
     HTMLMediaElement* mediaElement = toParentMediaElement(object);
     if (!mediaElement)
         return false;
 
     GraphicsContext* context = paintInfo.context;
-    RenderStyle* style = object->style();
+    const RenderStyle* style = object->style();
 
     paintRoundedSliderBackground(rect, style, context);
 
     // Calculate volume position for white background rectangle.
     float volume = mediaElement->volume();
     if (std::isnan(volume) || volume < 0)
         return true;
     if (volume > 1)
         volume = 1;
     if (!hasSource(mediaElement) || !mediaElement->hasAudio() || mediaElement->muted())
@@ skipping 184 matching lines @@
 {
     return formatChromiumMediaControlsTime(time, time);
 }
 
 String RenderMediaControls::formatMediaControlsCurrentTime(float currentTime, float duration)
 {
     return formatChromiumMediaControlsTime(currentTime, duration);
 }
 
 } // namespace blink