GN build: add content/public/common:mojo_bindings dependency to content/app:both

GN build: add content/public/common:mojo_bindings dependency to content/app:both

Without this dependency the compiler cannot find permission_status.mojom.h
when compiling content/app:both target from scratch.

BUG=

Committed: https://crrev.com/ebfb0de18948b49bbee7f07c406d3bbad82a3b5b
Cr-Commit-Position: refs/heads/master@{#309211}

[timvolodine, 2014-12-17 19:31:18]

timvolodine@chromium.org changed reviewers:
+ jam@chromium.org

[timvolodine, 2014-12-19 16:07:19]

timvolodine@chromium.org changed reviewers:
+ avi@chromium.org

[timvolodine, 2014-12-19 16:07:20]

+ avi@ : jam@ is OOO could you have a look pls?

[Avi (use Gerrit), 2014-12-19 16:10:31]

lgtm

[timvolodine, 2014-12-19 16:17:38]

The CQ bit was checked by timvolodine@chromium.org

[commit-bot: I haz the power, 2014-12-19 16:18:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/805883003/20001

[commit-bot: I haz the power, 2014-12-19 16:36:07]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-12-19 16:37:07]

Patchset 2 (id:??) landed as
https://crrev.com/ebfb0de18948b49bbee7f07c406d3bbad82a3b5b
Cr-Commit-Position: refs/heads/master@{#309211}