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

Source/core/platform/ScrollbarThemeComposite.h

Index: Source/core/platform/ScrollbarThemeComposite.h
diff --git a/Source/core/platform/ScrollbarThemeComposite.h b/Source/core/platform/ScrollbarThemeComposite.h
index f7a2bc37f38d3be6fe2ff3f153e5cc46b2542dba..7b6cc0c32e377a9a85bae90cbad5f65cbfdd3bbe 100644
--- a/Source/core/platform/ScrollbarThemeComposite.h
+++ b/Source/core/platform/ScrollbarThemeComposite.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 ScrollbarThemeComposite_h
@@ -52,7 +52,7 @@ public:
     virtual IntRect thumbRect(ScrollbarThemeClient*);
 
     virtual void splitTrack(ScrollbarThemeClient*, const IntRect& track, IntRect& startTrack, IntRect& thumb, IntRect& endTrack);
-    
+
     virtual int minimumThumbLength(ScrollbarThemeClient*);
 
     virtual void paintScrollbarBackground(GraphicsContext*, ScrollbarThemeClient*) { }