[remoting android] Refactor OAuthTokenFetcher for reusability

[remoting android] Refactor OAuthTokenFetcher for reusability

This allows the class to be used in host code.
* Token scope is passed in.
* Removed hardcoded error-resources.
* Moved into 'base' package, so it is separated from other client code.

BUG=602355
Committed: https://crrev.com/fdcec667a89dd09237ceec8df301dc1ca5f88ae9
Cr-Commit-Position: refs/heads/master@{#388395}

[Lambros, 2016-04-19 18:45:39]

lambroslambrou@chromium.org changed reviewers:
+ sergeyu@chromium.org

[Sergey Ulanov, 2016-04-20 00:04:19]

lgtm

[Lambros, 2016-04-20 00:08:31]

The CQ bit was checked by lambroslambrou@chromium.org

[commit-bot: I haz the power, 2016-04-20 00:08:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1902923002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1902923002/1

[commit-bot: I haz the power, 2016-04-20 01:17:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-22 19:19:37]

Description was changed from

==========
[remoting android] Refactor OAuthTokenFetcher for reusability

This allows the class to be used in host code.
* Token scope is passed in.
* Removed hardcoded error-resources.
* Moved into 'base' package, so it is separated from other client code.

BUG=602355
==========

to

==========
[remoting android] Refactor OAuthTokenFetcher for reusability

This allows the class to be used in host code.
* Token scope is passed in.
* Removed hardcoded error-resources.
* Moved into 'base' package, so it is separated from other client code.

BUG=602355

Committed: https://crrev.com/fdcec667a89dd09237ceec8df301dc1ca5f88ae9
Cr-Commit-Position: refs/heads/master@{#388395}
==========

[commit-bot: I haz the power, 2016-04-22 19:19:38]

Patchset 1 (id:??) landed as
https://crrev.com/fdcec667a89dd09237ceec8df301dc1ca5f88ae9
Cr-Commit-Position: refs/heads/master@{#388395}