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

Source/core/html/HTMLSourceElement.h

Index: Source/core/html/HTMLSourceElement.h
diff --git a/Source/core/html/HTMLSourceElement.h b/Source/core/html/HTMLSourceElement.h
index bd03ca83881ec30c014d4745d03a48134986ac91..1d13a9e8c44fe2cb798ce927840f8c49f70fd1d4 100644
--- a/Source/core/html/HTMLSourceElement.h
+++ b/Source/core/html/HTMLSourceElement.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 HTMLSourceElement_h
@@ -38,16 +38,16 @@ public:
 
     String media() const;
     String type() const;
-    void setSrc(const String&);    
+    void setSrc(const String&);
     void setMedia(const String&);
     void setType(const String&);
-    
+
     void scheduleErrorEvent();
     void cancelPendingErrorEvent();
 
 private:
     HTMLSourceElement(const QualifiedName&, Document*);
-    
+
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;