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

Source/core/editing/InsertNodeBeforeCommand.h

Index: Source/core/editing/InsertNodeBeforeCommand.h
diff --git a/Source/core/editing/InsertNodeBeforeCommand.h b/Source/core/editing/InsertNodeBeforeCommand.h
index 0a5255e61843ec921963a6409c82ae16c5b3a1ca..8e4b440d7b2b1b66809b0aea63293275c42fa360 100644
--- a/Source/core/editing/InsertNodeBeforeCommand.h
+++ b/Source/core/editing/InsertNodeBeforeCommand.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 InsertNodeBeforeCommand_h
@@ -43,11 +43,11 @@ private:
 
     virtual void doApply() OVERRIDE;
     virtual void doUnapply() OVERRIDE;
-    
+
 #ifndef NDEBUG
     virtual void getNodesInCommand(HashSet<Node*>&) OVERRIDE;
 #endif
-    
+
     RefPtr<Node> m_insertChild;
     RefPtr<Node> m_refChild;
     ShouldAssumeContentIsAlwaysEditable m_shouldAssumeContentIsAlwaysEditable;