[cc] Rename all cc/ filenames to Chromium style

cc/scrollbar_geometry_fixed_thumb.cc

 // Copyright 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 "config.h"
 
 #include "CCScrollbarGeometryFixedThumb.h"
 
 #include <cmath>
 #include <public/WebRect.h>
@@ skipping 74 matching lines @@
         afterThumbRect = WebRect(trackRect.x, trackRect.y + beforeThumbRect.height, trackRect.width, trackRect.y + trackRect.height - beforeThumbRect.y - beforeThumbRect.height);
     }
 }
 
 CCScrollbarGeometryFixedThumb::CCScrollbarGeometryFixedThumb(PassOwnPtr<WebScrollbarThemeGeometry> geometry)
     : CCScrollbarGeometryStub(geometry)
 {
 }
 
 }