ContentEditable plaintext-only crash fix.

Source/core/editing/ApplyStyleCommand.cpp

Index: Source/core/editing/ApplyStyleCommand.cpp
diff --git a/Source/core/editing/ApplyStyleCommand.cpp b/Source/core/editing/ApplyStyleCommand.cpp
index 43cc1ddea1e2dba61ed6d74fadb53a9ba138cbb5..ba5921b27ed347392278d6a89e1537a072cefd07 100644
--- a/Source/core/editing/ApplyStyleCommand.cpp
+++ b/Source/core/editing/ApplyStyleCommand.cpp
@@ -759,10 +759,12 @@ void ApplyStyleCommand::applyInlineStyleToNodeRange(EditingStyle* style, PassRef
                 break;
             // Add to this element's inline style and skip over its contents.
             HTMLElement* element = toHTMLElement(node.get());
+            next = NodeTraversal::nextSkippingChildren(node.get());
+            if (!style->style())
+                continue;
             RefPtr<MutableStylePropertySet> inlineStyle = copyStyleOrCreateEmpty(element->inlineStyle());
             inlineStyle->mergeAndOverrideOnConflict(style->style());
             setNodeAttribute(element, styleAttr, inlineStyle->asText());
-            next = NodeTraversal::nextSkippingChildren(node.get());
             continue;
         }