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

Source/core/page/PageGroup.h

Index: Source/core/page/PageGroup.h
diff --git a/Source/core/page/PageGroup.h b/Source/core/page/PageGroup.h
index f8845813525a98eb826bca673e518a0c8b90ca0d..c10f83a4b4b7bb1b94c4b8ece0711bc8ba31fcb9 100644
--- a/Source/core/page/PageGroup.h
+++ b/Source/core/page/PageGroup.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 PageGroup_h
@@ -73,5 +73,5 @@ namespace WebCore {
     };
 
 } // namespace WebCore
-    
+
 #endif // PageGroup_h