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

Source/core/editing/InsertListCommand.h

Index: Source/core/editing/InsertListCommand.h
diff --git a/Source/core/editing/InsertListCommand.h b/Source/core/editing/InsertListCommand.h
index e900a54047f9d5038d2586139f24984c8c65197f..13526e1f4651cce8449e07ba26ff0e3fc2ee5cdd 100644
--- a/Source/core/editing/InsertListCommand.h
+++ b/Source/core/editing/InsertListCommand.h
@@ -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.
  */
 
 #ifndef InsertListCommand_h
@@ -42,7 +42,7 @@ public:
     }
 
     static PassRefPtr<HTMLElement> insertList(Document*, Type);
-    
+
     virtual bool preservesTypingStyle() const { return true; }
 
 private: