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

Source/core/platform/SharedTimer.h

Index: Source/core/platform/SharedTimer.h
diff --git a/Source/core/platform/SharedTimer.h b/Source/core/platform/SharedTimer.h
index 46340603fe3a703cda391b01dae9d4753a7c6b71..eddeaf9548336dc33a1d8ff5a27bbabe3707a51a 100644
--- a/Source/core/platform/SharedTimer.h
+++ b/Source/core/platform/SharedTimer.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 SharedTimer_h
@@ -60,12 +60,12 @@ namespace WebCore {
         {
             setSharedTimerFiredFunction(function);
         }
-        
+
         virtual void setFireInterval(double interval)
         {
             setSharedTimerFireInterval(interval);
         }
-        
+
         virtual void stop()
         {
             stopSharedTimer();