[Android] Adjust generate file list for xwalk core library

The list has been changed after rebased to 34.
[Android] Fix unused variable warning for cookie store

It is treat as error after rebased to 34.
[Android] Change CommandLine import from content to base

The facility class for CommandLine has been moved from content
to base after rebased to 34.
Merge pull request #1563 from wang16/next

[Android] Fix the compiling failure after rebase to 34