[Android] Fix the invalid arguments issue in XWalkRuntimeClient.onActivityResult.

Missing the instance argument in onActivityResult, this causes exception while
onActivityResult is called.

BUG=https://github.com/crosswalk-project/crosswalk/issues/732
Merge pull request #733 from sqliu/otcshare-hotfix-onActivityResult

[Android] Fix the invalid arguments issue in XWalkRuntimeClient.onActivi...