introduce chrome/browser/common directory and move url_database(and its dependencies)

chrome/browser/common/url_database/url_database.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_HISTORY_URL_DATABASE_H_
-#define CHROME_BROWSER_HISTORY_URL_DATABASE_H_
+#ifndef CHROME_BROWSER_COMMON_URL_DATABASE_URL_DATABASE_H_
+#define CHROME_BROWSER_COMMON_URL_DATABASE_URL_DATABASE_H_
 
 #include "base/basictypes.h"
-#include "chrome/browser/history/history_types.h"
-#include "chrome/browser/search_engines/template_url_id.h"
+#include "chrome/browser/common/url_database/template_url_id.h"
+#include "chrome/browser/common/url_database/url_database_types.h"
 #include "sql/statement.h"
 
 class GURL;
+class IconMapping;
 
 namespace sql {
 class Connection;
 }
 
 namespace history {
 
-class VisitDatabase;  // For friend statement.
-
 // Encapsulates an SQL database that holds URL info.  This is a subset of the
 // full history data.  We split this class' functionality out from the larger
 // HistoryDatabase class to support maintaining separate databases of URLs with
 // different capabilities (for example, in-memory, or archived).
 //
 // This is refcounted to support calling InvokeLater() with some of its methods
 // (necessary to maintain ordering of DB operations).
 class URLDatabase {
  public:
   // Must call CreateURLTable() and CreateURLIndexes() before using to make
@@ skipping 91 matching lines @@
 
     DISALLOW_COPY_AND_ASSIGN(URLEnumeratorBase);
   };
 
   // A basic enumerator to enumerate urls
   class URLEnumerator : public URLEnumeratorBase {
    public:
     URLEnumerator();
 
     // Retreives the next url. Returns false if no more urls are available
-    bool GetNextURL(history::URLRow* r);
+    bool GetNextURL(URLRow* r);
 
    private:
     DISALLOW_COPY_AND_ASSIGN(URLEnumerator);
   };
 
   // A basic enumerator to enumerate icon mapping, it is only used for icon
   // mapping migration.
   class IconMappingEnumerator : public URLEnumeratorBase {
    public:
     IconMappingEnumerator();
@@ skipping 35 matching lines @@
   // Tries to find the shortest URL beginning with |base| that strictly
   // prefixes |url|, and has minimum visit_ and typed_counts as specified.
   // If found, fills in |info| and returns true; otherwise returns false,
   // leaving |info| unchanged.
   // We allow matches of exactly |base| iff |allow_base| is true.
   bool FindShortestURLFromBase(const std::string& base,
                                const std::string& url,
                                int min_visits,
                                int min_typed,
                                bool allow_base,
-                               history::URLRow* info);
+                               URLRow* info);
 
   // Keyword Search Terms ------------------------------------------------------
 
   // Sets the search terms for the specified url/keyword pair.
   bool SetKeywordSearchTermsForURL(URLID url_id,
                                    TemplateURLID keyword_id,
                                    const string16& term);
 
   // Looks up a keyword search term given a url id. Returns all the search terms
   // in |rows|. Returns true on success.
@@ skipping 14 matching lines @@
       TemplateURLID keyword_id,
       const string16& prefix,
       int max_count,
       std::vector<KeywordSearchTermVisit>* matches);
 
   // Deletes all searches matching |term|.
   bool DeleteKeywordSearchTerm(const string16& term);
 
   // Migration -----------------------------------------------------------------
 
-  // Do to a bug we were setting the favicon of about:blank. This forces
+  // Due to a bug we were setting the favicon of about:blank. This forces
   // about:blank to have no icon or title. Returns true on success, false if
   // the favicon couldn't be updated.
   bool MigrateFromVersion11ToVersion12();
 
   // Initializes the given enumerator to enumerator all URL and icon mappings
   // in the database. Only used for icon mapping migration.
   bool InitIconMappingEnumeratorForEverything(
       IconMappingEnumerator* enumerator);
 
  protected:
-  friend class VisitDatabase;
-
-  // See HISTORY_URL_ROW_FIELDS below.
+  // See URL_DATABASE_ROW_FIELDS below.
   static const char kURLRowFields[];
 
   // The number of fiends in kURLRowFields. If callers need additional
   // fields, they can add their 0-based index to this value to get the index of
   // fields following kURLRowFields.
   static const int kNumURLRowFields;
 
   // Drops the starred_id column from urls, returning true on success. This does
   // nothing (and returns true) if the urls doesn't contain the starred_id
   // column.
@@ skipping 36 matching lines @@
   virtual sql::Connection& GetDB() = 0;
 
  private:
   // True if InitKeywordSearchTermsTable() has been invoked. Not all subclasses
   // have keyword search terms.
   bool has_keyword_search_terms_;
 
   DISALLOW_COPY_AND_ASSIGN(URLDatabase);
 };
 
+}  // namespace history
+
 // The fields and order expected by FillURLRow(). ID is guaranteed to be first
 // so that DISTINCT can be prepended to get distinct URLs.
 //
 // This is available BOTH as a macro and a static string (kURLRowFields). Use
 // the macro if you want to put this in the middle of an otherwise constant
 // string, it will save time doing string appends. If you have to build a SQL
 // string dynamically anyway, use the constant, it will save space.
-#define HISTORY_URL_ROW_FIELDS \
+#define URL_DATABASE_ROW_FIELDS \
     " urls.id, urls.url, urls.title, urls.visit_count, urls.typed_count, " \
     "urls.last_visit_time, urls.hidden "
 
-}  // history
-
-#endif  // CHROME_BROWSER_HISTORY_URL_DATABASE_H_
+#endif  // CHROME_BROWSER_COMMON_URL_DATABASE_URL_DATABASE_H_