Move migration code out of WebDatabase and into table-specific classes.

chrome/browser/webdata/autofill_table.h

Index: chrome/browser/webdata/autofill_table.h
diff --git a/chrome/browser/webdata/autofill_table.h b/chrome/browser/webdata/autofill_table.h
index af7648fd22b89d1c974e570060430b56e8b597eb..0b967b9bfa21077d61dfdfbc7a95f5ad483a2f9b 100644
--- a/chrome/browser/webdata/autofill_table.h
+++ b/chrome/browser/webdata/autofill_table.h
@@ -259,6 +259,18 @@ class AutofillTable : public WebDatabaseTable {
   // Clear all profiles.
   bool ClearAutofillProfiles();
 
+  // Table migration functions.
+  bool AddCardNumberEncryptedColumnForVersion23();

[dhollowa, 2011/04/04 16:13:20]

How about names like |MigrateToVersion23EncryptedCards|,
|MigrateToVersion24OversizedStrings|, ...?  It'd be nice to know immediately
that these are migration methods and hence are intertwined with the order of
others.

[Bons, 2011/04/05 11:05:13]

Done.

+  bool CleanupOversizedStringFieldsForVersion24();
+  bool UpdateLegacyCreditCardsForVersion27();
+  bool AddDateModifedForVersion30();
+  bool AddGUIDToCreditCardsAndProfilesForVersion31();
+  bool UpdateProfilesAndCreditCardsForVersion32();
+  bool UpdateProfilesBasedOnFirstNameForVersion33();
+  bool UpdatesProfilesBasedOnCountryCodeForVersion34();
+  bool CorrectGreatBritainCountryCodesForVersion35();
+  bool MergeAndCullOlderProfilesForVersion36();
+
  private:
   FRIEND_TEST_ALL_PREFIXES(AutofillTableTest, Autofill);
   FRIEND_TEST_ALL_PREFIXES(AutofillTableTest, Autofill_AddChanges);