Remove WalletDatabase::Create, CreateMock, and CreateDummy

These are superseded by CreateWalletDatabase, CreateMockWalletDatabase,
and CreateDummyWalletDatabase

src/wallet/bdb.h

@@ -120,25 +120,6 @@ class BerkeleyDatabase
         }
     }
 
-    /** Return object for accessing database at specified path. */
-    static std::unique_ptr<BerkeleyDatabase> Create(const fs::path& path)
-    {
-        std::string filename;
-        return MakeUnique<BerkeleyDatabase>(GetWalletEnv(path, filename), std::move(filename));
-    }
-
-    /** Return object for accessing dummy database with no read/write capabilities. */
-    static std::unique_ptr<BerkeleyDatabase> CreateDummy()
-    {
-        return MakeUnique<BerkeleyDatabase>();
-    }
-
-    /** Return object for accessing temporary in-memory database. */
-    static std::unique_ptr<BerkeleyDatabase> CreateMock()
-    {
-        return MakeUnique<BerkeleyDatabase>(std::make_shared<BerkeleyEnvironment>(), "");
-    }
-
     /** Rewrite the entire database on disk, with the exception of key pszSkip if non-zero
      */
     bool Rewrite(const char* pszSkip=nullptr);