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

Source/core/platform/Pasteboard.h

Index: Source/core/platform/Pasteboard.h
diff --git a/Source/core/platform/Pasteboard.h b/Source/core/platform/Pasteboard.h
index 48b4200679d4016931ddcc3a68af2e03602a7142..db02978e9d74f835fef93795e0f10c7c6c575df0 100644
--- a/Source/core/platform/Pasteboard.h
+++ b/Source/core/platform/Pasteboard.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 Pasteboard_h
@@ -49,7 +49,7 @@ class Range;
 class SharedBuffer;
 
 enum ShouldSerializeSelectedTextForClipboard { DefaultSelectedTextType, IncludeImageAltTextForClipboard };
-    
+
 class Pasteboard {
     WTF_MAKE_NONCOPYABLE(Pasteboard); WTF_MAKE_FAST_ALLOCATED;
 public: