Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

public/platform/WebLayer.h

 /*
  * Copyright (C) 2011 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 104 matching lines @@
     // etc).
     virtual void setUseParentBackfaceVisibility(bool) = 0;
 
     virtual void setBackgroundColor(WebColor) = 0;
     virtual WebColor backgroundColor() const = 0;
 
     // Clear the filters in use by passing in a newly instantiated
     // WebFilterOperations object.
     virtual void setFilters(const WebFilterOperations&) = 0;
 
-    // Set the root of the image filter graph for this layer. The 
+    // Set the root of the image filter graph for this layer. The
     // implementation should grab a ref on the passed-in filter in order
     // to retain ownership. The passed-in graph will be unref'ed by the
     // caller after this call.
     virtual void setFilter(SkImageFilter*) = 0;
 
     // Apply filters to pixels that show through the background of this layer.
     // Note: These filters are only possible on layers that are drawn directly
     // to a root render surface with an opaque background. This means if an
     // ancestor of the background-filtered layer sets certain properties
     // (opacity, transforms), it may conflict and hide the background filters.
@@ skipping 75 matching lines @@
     // so, but this is to facilitate benchmarks and tests.
     virtual void setForceRenderSurface(bool) = 0;
 
     // True if the layer is not part of a tree attached to a WebLayerTreeView.
     virtual bool isOrphan() const = 0;
 };
 
 } // namespace WebKit
 
 #endif // WebLayer_h