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

Source/core/dom/ProgressEvent.cpp

Index: Source/core/dom/ProgressEvent.cpp
diff --git a/Source/core/dom/ProgressEvent.cpp b/Source/core/dom/ProgressEvent.cpp
index 18d698080bbab014f8fe3d6a01310342b0c078f4..da8a3c1f369a462da64d33e7b12d1906f95ca416 100644
--- a/Source/core/dom/ProgressEvent.cpp
+++ b/Source/core/dom/ProgressEvent.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"
@@ -62,7 +62,7 @@ ProgressEvent::ProgressEvent(const AtomicString& type, bool lengthComputable, un
 {
     ScriptWrappable::init(this);
 }
-    
+
 const AtomicString& ProgressEvent::interfaceName() const
 {
     return eventNames().interfaceForProgressEvent;