Fix calling of device.PushChangedFiles in android platform telemetry

Fix calling of device.PushChangedFiles in android platform telemetry.

This fixes the call of device.PushChangedFiles; see example of correct usage here: https://code.google.com/p/chromium/codesearch#chromium/src/build/android/provision_devices.py&q=PushChangedFiles

This change should fix the breakage of the chrome-proxy tests that was
introduced in https://codereview.chromium.org/656383002/.

BUG=429313
Committed: https://crrev.com/4db20127805bede08bc35f3dcb784f60a51538bc
Cr-Commit-Position: refs/heads/master@{#302556}

[sclittle, 2014-10-31 20:42:53]

sclittle@chromium.org changed reviewers:
+ wuhu@google.com

[sclittle, 2014-10-31 20:42:54]

wuhu: all

Thanks in advance

[sclittle, 2014-10-31 20:46:34]

sclittle@chromium.org changed reviewers:
+ marja@chromium.org

[sclittle, 2014-10-31 20:46:34]

Added marja as reviewer for OWNERS

[wuhu, 2014-10-31 21:10:54]

On 2014/10/31 20:46:34, sclittle wrote:
> Added marja as reviewer for OWNERS

LGTM

[marja, 2014-11-03 08:37:35]

lgtm

[sclittle, 2014-11-03 17:51:30]

The CQ bit was checked by sclittle@chromium.org

[commit-bot: I haz the power, 2014-11-03 17:52:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/689213002/1

[commit-bot: I haz the power, 2014-11-04 02:47:25]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-04 02:48:06]

Patchset 1 (id:??) landed as
https://crrev.com/4db20127805bede08bc35f3dcb784f60a51538bc
Cr-Commit-Position: refs/heads/master@{#302556}