Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/dom/CompositionEvent.idl

Index: Source/core/dom/CompositionEvent.idl
diff --git a/Source/core/dom/CompositionEvent.idl b/Source/core/dom/CompositionEvent.idl
index 4f1a5b0075c57bea46ef71f2eec9f28ee242856c..c54d50f48bc61ee0490ea85657fed77acfa73e6f 100644
--- a/Source/core/dom/CompositionEvent.idl
+++ b/Source/core/dom/CompositionEvent.idl
@@ -9,7 +9,7 @@
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
@@ -20,7 +20,7 @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 [
@@ -29,10 +29,10 @@
 
     [InitializedByEventConstructor] readonly attribute DOMString data;
 
-    void initCompositionEvent([Default=Undefined] optional DOMString typeArg, 
-                              [Default=Undefined] optional boolean canBubbleArg, 
-                              [Default=Undefined] optional boolean cancelableArg, 
-                              [Default=Undefined] optional Window viewArg, 
+    void initCompositionEvent([Default=Undefined] optional DOMString typeArg,
+                              [Default=Undefined] optional boolean canBubbleArg,
+                              [Default=Undefined] optional boolean cancelableArg,
+                              [Default=Undefined] optional Window viewArg,
                               [Default=Undefined] optional DOMString dataArg);
 
 };