Set default for prefs::kGCMChannelEnabled to true on all channels

Set default for prefs::kGCMChannelEnabled to true on all channels

GCMProfileService tweaks the default value of prefs::kGCMChannelEnabled
so that GCM is enabled by default on the canary/dev/custom channels only.
However, the code that uses this pref has been broken for three months
now (since http://crrev.com/253787) so that it completely ignores the
default pref value. Hence, there is no need to tweak the default.

BUG=376746
TEST=Manual

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272669

[bartfab (slow), 2014-05-23 12:28:04]

Hi Jian,

Could you take a look please?

[jianli, 2014-05-23 17:14:30]

lgtm

[bartfab (slow), 2014-05-23 17:49:35]

The CQ bit was checked by bartfab@chromium.org

[commit-bot: I haz the power, 2014-05-23 17:51:05]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/bartfab@chromium.org/301433002/1

[commit-bot: I haz the power, 2014-05-23 21:19:40]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  mac_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/mac_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-05-24 01:23:30]

Change committed as 272669