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

Source/core/editing/FormatBlockCommand.h

Index: Source/core/editing/FormatBlockCommand.h
diff --git a/Source/core/editing/FormatBlockCommand.h b/Source/core/editing/FormatBlockCommand.h
index f5f810b318bc7231654b72bfe93f031a10a26559..c917832c3f6b459f45827c823dc10fc7b864ac45 100644
--- a/Source/core/editing/FormatBlockCommand.h
+++ b/Source/core/editing/FormatBlockCommand.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 FormatBlockCommand_h
@@ -44,7 +44,7 @@ public:
     {
         return adoptRef(new FormatBlockCommand(document, tagName));
     }
-    
+
     virtual bool preservesTypingStyle() const { return true; }
 
     static Element* elementForFormatBlockCommand(Range*);