Move IDL implements statements to IDL files that implement the interface

Source/core/svg/SVGTextContentElement.idl

 /*
  * Copyright (C) 2006 Apple 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
                              [Default=Undefined,IsIndex] optional unsigned long length);
     [RaisesException] SVGPoint getStartPositionOfChar([Default=Undefined,IsIndex] optional unsigned long offset);
     [RaisesException] SVGPoint getEndPositionOfChar([Default=Undefined,IsIndex] optional unsigned long offset);
     [RaisesException] SVGRect getExtentOfChar([Default=Undefined,IsIndex] optional unsigned long offset);
     [RaisesException] float getRotationOfChar([Default=Undefined,IsIndex] optional unsigned long offset);
     long getCharNumAtPosition([Default=Undefined] optional SVGPoint point);
     [RaisesException] void selectSubString([Default=Undefined,IsIndex] optional unsigned long offset, 
                          [Default=Undefined,IsIndex] optional unsigned long length);
 };
 
+SVGTextContentElement implements SVGTests;
+