Remove INJECT_EVENTS permissions from test APKs.

Remove INJECT_EVENTS permissions from test APKs.

This permission only applies to system apps, so the test APKs couldn't
actually use the permission.

BUG=502028
Committed: https://crrev.com/90d3bdc22f7826554dc0221f08bcc035bc7d9e54
Cr-Commit-Position: refs/heads/master@{#336938}

[newt (away), 2015-06-30 21:23:06]

The CQ bit was checked by newt@chromium.org to run a CQ dry run

[newt (away), 2015-06-30 21:23:42]

newt@chromium.org changed reviewers:
+ tedchoc@chromium.org

[newt (away), 2015-06-30 21:23:42]

PTAL

[commit-bot: I haz the power, 2015-06-30 21:24:47]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1206323004/1

[Ted C, 2015-06-30 21:48:02]

tedchoc@chromium.org changed reviewers:
+ jbudorick@chromium.org

[Ted C, 2015-06-30 21:48:03]

lgtm

+jbudorick -- fyi

[newt (away), 2015-06-30 22:24:58]

The CQ bit was checked by newt@chromium.org

[newt (away), 2015-06-30 22:24:58]

The patchset sent to the CQ was uploaded after l-g-t-m from tedchoc@chromium.org
Link to the patchset: https://codereview.chromium.org/1206323004/#ps20001
(title: "don't touch src/mojo")

[commit-bot: I haz the power, 2015-06-30 22:27:09]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1206323004/20001

[commit-bot: I haz the power, 2015-07-01 00:37:47]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-07-01 00:38:39]

Patchset 2 (id:??) landed as
https://crrev.com/90d3bdc22f7826554dc0221f08bcc035bc7d9e54
Cr-Commit-Position: refs/heads/master@{#336938}