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

Source/core/editing/DeleteFromTextNodeCommand.h

Index: Source/core/editing/DeleteFromTextNodeCommand.h
diff --git a/Source/core/editing/DeleteFromTextNodeCommand.h b/Source/core/editing/DeleteFromTextNodeCommand.h
index aeeba83349c885eddde15d5dc0f5afd19a527f61..688c11707e345770631eb658e8599b22bb2704f4 100644
--- a/Source/core/editing/DeleteFromTextNodeCommand.h
+++ b/Source/core/editing/DeleteFromTextNodeCommand.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 DeleteFromTextNodeCommand_h
@@ -44,11 +44,11 @@ private:
 
     virtual void doApply() OVERRIDE;
     virtual void doUnapply() OVERRIDE;
-    
+
 #ifndef NDEBUG
     virtual void getNodesInCommand(HashSet<Node*>&) OVERRIDE;
 #endif
-    
+
     RefPtr<Text> m_node;
     unsigned m_offset;
     unsigned m_count;