Revert 152946 - Replace HistoryQuickProvider protobuf-based caching with an SQLite-based database.

chrome/browser/history/in_memory_url_index_types.h

Index: chrome/browser/history/in_memory_url_index_types.h
===================================================================
--- chrome/browser/history/in_memory_url_index_types.h	(revision 152962)
+++ chrome/browser/history/in_memory_url_index_types.h	(working copy)
@@ -117,7 +117,6 @@
 
 // A map from character to the word_ids of words containing that character.
 typedef std::set<WordID> WordIDSet;  // An index into the WordList.
-// TODO(mrossetti): Consider using <multimap>. See http://crbug.com/138334
 typedef std::map<char16, WordIDSet> CharWordIDMap;
 
 // A map from word (by word_id) to history items containing that word.
@@ -143,6 +142,24 @@
 };
 typedef std::map<HistoryID, RowWordStarts> WordStartsMap;
 
+// A RefCountedThreadSafe class that manages a bool used for passing around
+// success when saving the persistent data for the InMemoryURLIndex in a cache.
+class RefCountedBool : public base::RefCountedThreadSafe<RefCountedBool> {
+ public:
+  explicit RefCountedBool(bool value) : value_(value) {}
+
+  bool value() const { return value_; }
+  void set_value(bool value) { value_ = value; }
+
+ private:
+  friend class base::RefCountedThreadSafe<RefCountedBool>;
+  virtual ~RefCountedBool();
+
+  bool value_;
+
+  DISALLOW_COPY_AND_ASSIGN(RefCountedBool);
+};
+
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_IN_MEMORY_URL_INDEX_TYPES_H_