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

Source/core/editing/AppendNodeCommand.cpp

Index: Source/core/editing/AppendNodeCommand.cpp
diff --git a/Source/core/editing/AppendNodeCommand.cpp b/Source/core/editing/AppendNodeCommand.cpp
index 27f4bf84cf637a6e273b64dbfca5ee4625a857f6..ef9dcd49a2f616fb1ffaa79e64401644f51d569a 100644
--- a/Source/core/editing/AppendNodeCommand.cpp
+++ b/Source/core/editing/AppendNodeCommand.cpp
@@ -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.
  */
 
 #include "config.h"
@@ -70,7 +70,7 @@ void AppendNodeCommand::doUnapply()
 {
     if (!m_parent->rendererIsEditable())
         return;
-        
+
     // Need to notify this before actually deleting the text
     if (AXObjectCache::accessibilityEnabled())
         sendAXTextChangedIgnoringLineBreaks(m_node.get(), AXObjectCache::AXTextDeleted);