Raze old WebDatabases.

components/search_engines/keyword_table.h

Index: components/search_engines/keyword_table.h
diff --git a/components/search_engines/keyword_table.h b/components/search_engines/keyword_table.h
index 62e7e798f5d99cab905cb1842e536b9f01c5ca35..ef4569424fa93fdac48db574b8540357c2b6b26a 100644
--- a/components/search_engines/keyword_table.h
+++ b/components/search_engines/keyword_table.h
@@ -126,19 +126,6 @@ class KeywordTable : public WebDatabaseTable {
   static std::string GetKeywordColumns();
 
   // Table migration functions.
-  bool MigrateToVersion21AutoGenerateKeywordColumn();
-  bool MigrateToVersion25AddLogoIDColumn();
-  bool MigrateToVersion26AddCreatedByPolicyColumn();
-  bool MigrateToVersion28SupportsInstantColumn();
-  bool MigrateToVersion29InstantURLToSupportsInstant();
-  bool MigrateToVersion38AddLastModifiedColumn();
-  bool MigrateToVersion39AddSyncGUIDColumn();
-  bool MigrateToVersion44AddDefaultSearchProviderBackup();
-  bool MigrateToVersion45RemoveLogoIDAndAutogenerateColumns();
-  bool MigrateToVersion47AddAlternateURLsColumn();
-  bool MigrateToVersion48RemoveKeywordsBackup();
-  bool MigrateToVersion49AddSearchTermsReplacementKeyColumn();
-  bool MigrateToVersion52AddImageSearchAndPOSTSupport();
   bool MigrateToVersion53AddNewTabURLColumn();
   bool MigrateToVersion59RemoveExtensionKeywords();