Relax strict quota limit checks when reading pre-existing DomStorage database files. The other chec…

webkit/dom_storage/dom_storage_map.h

Index: webkit/dom_storage/dom_storage_map.h
===================================================================
--- webkit/dom_storage/dom_storage_map.h	(revision 125211)
+++ webkit/dom_storage/dom_storage_map.h	(working copy)
@@ -30,10 +30,13 @@
                NullableString16* old_value);
   bool RemoveItem(const string16& key, string16* old_value);
 
-  // Replaces values_ with |map|. Returns true on success, false
-  // if the swap was prevented because |map| would exceed this
-  // DomStorageMap's quota_.
-  bool SwapValues(ValuesMap* map);
+  // Swaps this instances values_ with |map|.
+  // Note: to grandfather in pre-existing files that are overbudget,
+  // this method does not do quota checking.
+  void SwapValues(ValuesMap* map);
+
+  // Creates a new instance of DomStorageMap containing
+  // a deep copy of values_.
   DomStorageMap* DeepCopy() const;
 
   size_t bytes_used() const { return bytes_used_; }