Revert "Use libappindicator to show icons in all cases"

This reverts commit 05a0b26e256a7fc45836ce69e43e439850d5dcce.

Reason for revert: http://crbug.com/815046 - same swarming bots failing because they don't have libappindicator3.

Original change's description:
> Use libappindicator to show icons in all cases
>
> libappindicator will transparently use GtkStatusIcon if an AppIndicator
> listener is not available. We will lose the left click action however,
> and instead the right-click menu will be shown in all instances.
>
> Using libappindicator in all cases not only reduces code complexity,
> but also abstracts away the complexity of determining when to use
> application indicators (vs legacy icons), which is a little more
> complicated with newer versions of GNOME removing the legacy icon tray,
> but older versions of GNOME not showing the application indicator by
> default.
>
> I also fixed an issue with detecting GNOME. The environment variable
> value is often prefixed with the distro.
>
> Bug: 799144, 797332, 419673
> Change-Id: I156698f1b37ba216b4df11fa2f17dd7012c593fa
> Reviewed-on: https://chromium-review.googlesource.com/911820
> Reviewed-by: Elliot Glaysher <erg@chromium.org>
> Reviewed-by: Scott Graham <scottmg@chromium.org>
> Reviewed-by: Gabriel Charette <gab@chromium.org>
> Commit-Queue: Tim Brown <timbrown@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#538635}

TBR=thomasanderson@chromium.org

Change-Id: I61db904019740f878c4f6d6303e600b717d7888d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 799144, 797332, 419673
Reviewed-on: https://chromium-review.googlesource.com/934701
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538800}

CrOS-Libchrome-Original-Commit: fda969051971b257fb637815b15f03e2353ef2e5
2 files changed
tree: cb3889a79ba9e04061520609c12a27dc73b9fddc
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/