Fix trailing whitespace in .cpp, .h, and .idl files (ex. Source/core)

Source/modules/notifications/NotificationController.h

Index: Source/modules/notifications/NotificationController.h
diff --git a/Source/modules/notifications/NotificationController.h b/Source/modules/notifications/NotificationController.h
index a7bf28fcf3e8ca7ebf3074ebb5a32e7f25962526..a0abd638ae8c2131ecd1cf093d1a68d25838d1ba 100644
--- a/Source/modules/notifications/NotificationController.h
+++ b/Source/modules/notifications/NotificationController.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 NotificationController_h
@@ -47,7 +47,7 @@ public:
     static NotificationClient* clientFrom(Page*);
 
     NotificationClient* client() { return m_client; }
-    
+
 private:
     explicit NotificationController(NotificationClient*);