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

Source/core/editing/SetNodeAttributeCommand.cpp

Index: Source/core/editing/SetNodeAttributeCommand.cpp
diff --git a/Source/core/editing/SetNodeAttributeCommand.cpp b/Source/core/editing/SetNodeAttributeCommand.cpp
index 697234f329251eb34380dc5b8f450281ff640c12..1218e02a21a8bd177996c28de9cb28f7e59e1847 100644
--- a/Source/core/editing/SetNodeAttributeCommand.cpp
+++ b/Source/core/editing/SetNodeAttributeCommand.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"
@@ -31,7 +31,7 @@
 
 namespace WebCore {
 
-SetNodeAttributeCommand::SetNodeAttributeCommand(PassRefPtr<Element> element, 
+SetNodeAttributeCommand::SetNodeAttributeCommand(PassRefPtr<Element> element,
         const QualifiedName& attribute, const AtomicString& value)
     : SimpleEditCommand(element->document())
     , m_element(element)