[Android] Switch to DeviceUtils version of RunShellCommand.

build/android/pylib/android_commands.py

Index: build/android/pylib/android_commands.py
diff --git a/build/android/pylib/android_commands.py b/build/android/pylib/android_commands.py
index 960f2ae96381370eaf49be6c87a4e6589b5c5616..18018d252d5da4fd8818fd0f61fcff4fbbc34647 100644
--- a/build/android/pylib/android_commands.py
+++ b/build/android/pylib/android_commands.py
@@ -656,12 +656,10 @@ class AndroidCommands(object):
     preferred_apis = {
         'getprop': 'system_properties[<PROPERTY>]',
         'setprop': 'system_properties[<PROPERTY>]',
-        'su': 'RunShellCommandWithSU()',
         }
 
     # A dict of commands to methods that may call them.
     whitelisted_callers = {
-        'su': 'RunShellCommandWithSU',
         'getprop': 'ProvisionDevices',
         }