Make SpellChecker::didBeginEdit() not to crash with IFRAME parameter

third_party/WebKit/Source/core/editing/spellcheck/SpellChecker.cpp

Index: third_party/WebKit/Source/core/editing/spellcheck/SpellChecker.cpp
diff --git a/third_party/WebKit/Source/core/editing/spellcheck/SpellChecker.cpp b/third_party/WebKit/Source/core/editing/spellcheck/SpellChecker.cpp
index 5ced5f51e552afcf9632cbe705ffc64ad2f121cd..07c4c9611ec3ad3495929e7c0048a1b8d5ead985 100644
--- a/third_party/WebKit/Source/core/editing/spellcheck/SpellChecker.cpp
+++ b/third_party/WebKit/Source/core/editing/spellcheck/SpellChecker.cpp
@@ -140,6 +140,8 @@ void SpellChecker::didBeginEditing(Element* element)
         }
 
         if (isTextField || !parent->isAlreadySpellChecked()) {
+            if (EditingStrategy::editingIgnoresContent(element))

[yoichio, 2016/06/29 01:35:57]

Please add description why crash happens and this line solves that issue.

[yosin_UTC9, 2016/06/29 02:03:04]

Done.

+                return;
             // We always recheck textfields because markers are removed from them on blur.
             VisibleSelection selection = VisibleSelection::selectionFromContentsOfNode(element);
             markMisspellingsAndBadGrammar(selection);