Fix class name which has only space

third_party/WebKit/Source/core/dom/Element.cpp

Index: third_party/WebKit/Source/core/dom/Element.cpp
diff --git a/third_party/WebKit/Source/core/dom/Element.cpp b/third_party/WebKit/Source/core/dom/Element.cpp
index 047e339cba3e817a5c7eb056291cb3d2776f7584..cb7b7384384d17ea2784671686bed79a0fd058a4 100644
--- a/third_party/WebKit/Source/core/dom/Element.cpp
+++ b/third_party/WebKit/Source/core/dom/Element.cpp
@@ -1377,10 +1377,7 @@ void Element::classAttributeChanged(const AtomicString& newClassString) {
   } else {
     const SpaceSplitString& oldClasses = elementData()->classNames();
     document().styleEngine().classChangedForElement(oldClasses, *this);
-    if (classStringContentType == ClassStringContent::WhiteSpaceOnly)
-      elementData()->setClass(newClassString, shouldFoldCase);
-    else
-      elementData()->clearClass();
+    elementData()->setClass(newClassString, shouldFoldCase);

[skobes, 2016/10/14 20:41:30]

I don't quite understand how this works.  Setting class=" " seems like it should
produce classStringContentType == WhiteSpaceOnly, but this only changes the
logic for classStringContentType == Empty?

   }
 
   if (hasRareData())