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

Source/core/platform/PlatformMouseEvent.h

Index: Source/core/platform/PlatformMouseEvent.h
diff --git a/Source/core/platform/PlatformMouseEvent.h b/Source/core/platform/PlatformMouseEvent.h
index 0bb2aa7f920ca6c1c2c326859475735a0569c007..f54246135241321e60cb56db6a2e1f970baf1b13 100644
--- a/Source/core/platform/PlatformMouseEvent.h
+++ b/Source/core/platform/PlatformMouseEvent.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 PlatformMouseEvent_h
@@ -30,10 +30,10 @@
 #include "core/platform/graphics/IntPoint.h"
 
 namespace WebCore {
-    
+
     // These button numbers match the ones used in the DOM API, 0 through 2, except for NoButton which isn't specified.
     enum MouseButton { NoButton = -1, LeftButton, MiddleButton, RightButton };
-    
+
     class PlatformMouseEvent : public PlatformEvent {
     public:
         PlatformMouseEvent()