Merge branch 'db-code-cleanup' into 'master'

Clean up some database code

See merge request briar/briar!1071

briar-android/src/main/java/org/briarproject/briar/android/AndroidDatabaseConfig.java

@@ -24,9 +24,4 @@ class AndroidDatabaseConfig implements DatabaseConfig {
 	public File getDatabaseKeyDirectory() {
 		return keyDir;
 	}
-
-	@Override
-	public long getMaxSize() {
-		return Long.MAX_VALUE;
-	}
 }