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

Source/core/page/UserStyleSheet.h

Index: Source/core/page/UserStyleSheet.h
diff --git a/Source/core/page/UserStyleSheet.h b/Source/core/page/UserStyleSheet.h
index f60124fd86a938883a91ac68442add4d7df1ffcb..c5f8e197234cf9a4642a5ac0e4a12eabf7d3780a 100644
--- a/Source/core/page/UserStyleSheet.h
+++ b/Source/core/page/UserStyleSheet.h
@@ -20,9 +20,9 @@
  * 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 UserStyleSheet_h
 #define UserStyleSheet_h
 
@@ -69,5 +69,5 @@ private:
 };
 
 } // namespace WebCore
- 
+
 #endif // UserStyleSheet_h