Remove volumeType and options from addMount.

The arguments are no longer used. Remove them, and cleaning up the related
code.

BUG=282104
TEST=Ran browser_tests --gtest_filter="*FileSystemExtensionApiTest*:*FileManagerBrowserTest*:*FileBrowserPrivateApiTest*" and tested manually.

Review URL: https://codereview.chromium.org/25210002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226161 0039d316-1c4b-4281-b951-d872f2087c98
Use RefreshTokenIsAvailable to check that a refresh token is available.

Calls to GetRefreshToken must be guarded by RefreshTokenIsAvailable as
this calls is NOTREACHED on iOS.

BUG=NONE

Review URL: https://codereview.chromium.org/25221003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226162 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226162
Revise API comments of PPB_OutputProtection_Private

R=ddorwin@chromium.org, dmichael@chromium.org

Review URL: https://codereview.chromium.org/25240003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@226163 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 226163