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

Source/core/dom/NodeIterator.cpp

Index: Source/core/dom/NodeIterator.cpp
diff --git a/Source/core/dom/NodeIterator.cpp b/Source/core/dom/NodeIterator.cpp
index c23346fbeaba70c57035dcc5743bcb96ca3a2d63..bcd2bfe7d17e0950db178edb37ced4c1d40d3c99 100644
--- a/Source/core/dom/NodeIterator.cpp
+++ b/Source/core/dom/NodeIterator.cpp
@@ -198,7 +198,7 @@ void NodeIterator::updateForNodeRemoval(Node* removedNode, NodePointer& referenc
                 }
                 if (node) {
                     // Removing last node.
-                    // Need to move the pointer after the node preceding the 
+                    // Need to move the pointer after the node preceding the
                     // new reference node.
                     referenceNode.node = node;
                     referenceNode.isPointerBeforeNode = false;