[Android] Do not overwrite command when using the run_pie wrapper.

[Android] Do not overwrite command when using the run_pie wrapper.

Some change starting in M41 has started causing an existing bug in
GetAndroidToolsStatusAndOutput() to fail in ICS devices. When the
run_pie wrapper needs to be used, the call to `adb push' ends up
overwriting the original command that was going to be run on the device,
and the instrumentation tests fail like this:

> LD_LIBRARY_PATH=/data/local/tmp/forwarder/ /data/local/tmp/run_pie push /path/in/host/out/Release/run_pie /data/local/tmp/run_pie; echo %$?
[...]
[PIE Loader] dlopen() failed: Cannot load library: load_library[1095]: Library 'push' not found.

Fix it by using a different variable name for the `adb push' command
that must be run on the host.

BUG=373219
R=primiano@chromium.org, torne@chromium.org

Committed: https://crrev.com/2dca4da271cbab6f53832d98cc79a874a4e4244c
Cr-Commit-Position: refs/heads/master@{#316233}

[Raphael Kubo da Costa (rakuco), 2015-02-13 15:47:41]

raphael.kubo.da.costa@intel.com changed reviewers:
+ jbudorick@chromium.org, navabi@chromium.org, skyostil@chromium.org

[jbudorick, 2015-02-13 15:54:07]

lgtm

[jbudorick, 2015-02-13 15:55:04]

On 2015/02/13 15:54:07, jbudorick wrote:
> lgtm

and thanks for the patch!

[Raphael Kubo da Costa (rakuco), 2015-02-13 15:59:00]

The CQ bit was checked by raphael.kubo.da.costa@intel.com

[commit-bot: I haz the power, 2015-02-13 16:00:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/926023002/1

[commit-bot: I haz the power, 2015-02-13 17:31:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-13 17:31:26]

Patchset 1 (id:??) landed as
https://crrev.com/2dca4da271cbab6f53832d98cc79a874a4e4244c
Cr-Commit-Position: refs/heads/master@{#316233}