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

Source/core/editing/InsertTextCommand.h

Index: Source/core/editing/InsertTextCommand.h
diff --git a/Source/core/editing/InsertTextCommand.h b/Source/core/editing/InsertTextCommand.h
index 1bf5ebdf6528ee486400aff1323097ddaa58ca9e..3663bc46a5b2f9ddb0c32ee718a843473a71bc64 100644
--- a/Source/core/editing/InsertTextCommand.h
+++ b/Source/core/editing/InsertTextCommand.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 InsertTextCommand_h
@@ -70,7 +70,7 @@ private:
 
     Position positionInsideTextNode(const Position&);
     Position insertTab(const Position&);
-    
+
     bool performTrivialReplace(const String&, bool selectInsertedText);
     bool performOverwrite(const String&, bool selectInsertedText);
     void setEndingSelectionWithoutValidation(const Position& startPosition, const Position& endPosition);