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

Source/core/platform/PlatformKeyboardEvent.h

Index: Source/core/platform/PlatformKeyboardEvent.h
diff --git a/Source/core/platform/PlatformKeyboardEvent.h b/Source/core/platform/PlatformKeyboardEvent.h
index 3731b85cbba93b88361756ecb42d19bbfb10a2a9..4ad6ded921053f90121f81072b7d4bb09001190f 100644
--- a/Source/core/platform/PlatformKeyboardEvent.h
+++ b/Source/core/platform/PlatformKeyboardEvent.h
@@ -21,7 +21,7 @@
  * 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 PlatformKeyboardEvent_h
@@ -101,7 +101,7 @@ namespace WebCore {
         bool m_isKeypad;
         bool m_isSystemKey;
     };
-    
+
 } // namespace WebCore
 
 #endif // PlatformKeyboardEvent_h