Revert of [Telemetry] Remove adb_commands from android_browser_backend and android_browser_backend_setting

Revert of [Telemetry] Remove adb_commands from android_browser_backend and android_browser_backend_setting (patchset #3 id:40001 of https://codereview.chromium.org/1226373004/)

Reason for revert:
This patch broke the following perf bots:

http://build.chromium.org/p/chromium.perf/builders/Android%20Nexus4%20Perf/builds/3536/steps/memory.memory_health_plan/logs/stdio
http://build.chromium.org/p/chromium.perf/builders/Android%20Nexus6%20Perf/builds/1232/steps/memory.memory_health_plan/logs/stdio
http://build.chromium.org/p/chromium.perf/builders/Android%20Nexus7v2%20Perf/builds/4903/steps/memory.memory_health_plan/logs/stdio
http://build.chromium.org/p/chromium.perf/builders/Android%20Nexus9%20Perf/builds/467/steps/memory.memory_health_plan/logs/stdio
http://build.chromium.org/p/chromium.perf/builders/Android%20One%20Perf/builds/1204/steps/memory.memory_health_plan/logs/stdio

Original issue's description:
> Re-land https://codereview.chromium.org/1213423003/
> The original patch has been uploaded in patch set 2 to make the diff clearer.
>
> Remove adb_commands from android_browser_backend and android_browser_backend_settings.
>
> Pulled from https://codereview.chromium.org/1167173002/
>
> BUG=476709
>
> Committed: https://crrev.com/6baec756afca1f9949f6ff0e0252dd070bb86349
> Cr-Commit-Position: refs/heads/master@{#338313}

TBR=nednguyen@chromium.org,jbudorick@chromium.org,kbr@chromium.org,nednguyen@google.com,boliu@chromium.org,skyostil@chromium.org,navabi@chromium.org,sullivan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=476709
Committed: https://crrev.com/6fc67a32a8cbcf1d8ecb0ebbf2c5a2fb4d80bb15
Cr-Commit-Position: refs/heads/master@{#338498}

[alex clarke (OOO till 29th), 2015-07-13 11:31:31]

Created Revert of [Telemetry] Remove adb_commands from android_browser_backend
and android_browser_backend_setting