Simplify fileBrowserPrivate.getDriveConnectionStatus().

Simplify fileBrowserPrivate.getDriveConnectionStatus().

The "reasons" field had been a subset of {NO_SERVICE, NO_NETWORK, NOT_READY},
but it is now used only for signaling errors when it has NOT_READY
without other reasons. This can more simply be represented
by a single "reason" field whose value is set in the order:
NO_SERVICE > NO_NETWORK > NOT_READY, i.e., NOT_READY is set
only when other two states are not set.

BUG=237427
R=benwells@chromium.org, yoshiki@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=238318

[kinaba, 2013-12-02 07:42:33]

yoshiki: everything.
benwells: on the private api json change.

[kinaba, 2013-12-02 07:52:42]

On 2013/12/02 07:42:33, kinaba wrote:
> yoshiki: everything.
> benwells: on the private api json change.

Slightly updated the patch.

[benwells, 2013-12-02 21:18:22]

.json lgtm

[yoshiki, 2013-12-03 02:38:35]

lgtm

[commit-bot: I haz the power, 2013-12-03 02:48:59]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kinaba@chromium.org/98493003/20001

[commit-bot: I haz the power, 2013-12-03 05:54:36]

Retried try job too often on mac_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-12-03 05:55:49]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/kinaba@chromium.org/98493003/20001

[kinaba, 2013-12-03 07:38:39]

Committed patchset #2 manually as r238318 (presubmit successful).