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

Source/modules/mediasource/WebKitMediaSource.idl

Index: Source/modules/mediasource/WebKitMediaSource.idl
diff --git a/Source/modules/mediasource/WebKitMediaSource.idl b/Source/modules/mediasource/WebKitMediaSource.idl
index 61eaa1c4f8d667045188b52a3bd55e6ab65982e8..388e5d863f79bef5f887a233f3e14635ba402f16 100644
--- a/Source/modules/mediasource/WebKitMediaSource.idl
+++ b/Source/modules/mediasource/WebKitMediaSource.idl
@@ -27,7 +27,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
- 
+
 [
     NoInterfaceObject,
     EnabledAtRuntime=webKitMediaSource,
@@ -47,7 +47,7 @@
     [RaisesException] void removeSourceBuffer(WebKitSourceBuffer buffer);
 
     readonly attribute DOMString readyState;
-    
+
     [RaisesException] void endOfStream([Default=NullString] optional DOMString error);
 
     static boolean isTypeSupported (DOMString type);