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

Source/core/page/AbstractView.idl

Index: Source/core/page/AbstractView.idl
diff --git a/Source/core/page/AbstractView.idl b/Source/core/page/AbstractView.idl
index 371bb15bf42a71ea62edf53a99d8a26b376dae07..60c537f55507d3adde79a9a9b47d6b9da99b1e82 100644
--- a/Source/core/page/AbstractView.idl
+++ b/Source/core/page/AbstractView.idl
@@ -21,12 +21,12 @@
  * 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.
  */
 
 // Introduced in DOM Level 2:
 [
-    
+
 ] interface AbstractView {
     readonly attribute Document document;
     readonly attribute StyleMedia styleMedia;