[Android] Remove more uses of android_commands from build/android/pylib.

build/android/pylib/base/base_test_runner.py

Index: build/android/pylib/base/base_test_runner.py
diff --git a/build/android/pylib/base/base_test_runner.py b/build/android/pylib/base/base_test_runner.py
index 1ca033834c4d446bb2b655de12573fae54fe522b..2a7fdd3d6ed6fb5ba26cace9ef9f738c919dfbf3 100644
--- a/build/android/pylib/base/base_test_runner.py
+++ b/build/android/pylib/base/base_test_runner.py
@@ -26,14 +26,15 @@ NET_TEST_SERVER_PORT_INFO_FILE = 'net-test-server-ports'
 class BaseTestRunner(object):
   """Base class for running tests on a single device."""
 
-  def __init__(self, device_serial, tool):
+  def __init__(self, device, tool):
     """
       Args:
-        device: Tests will run on the device of this ID.
+        device: An instance of DeviceUtils that the tests will run on.
         tool: Name of the Valgrind tool.
     """
-    self.device_serial = device_serial
-    self.device = device_utils.DeviceUtils(device_serial)
+    assert isinstance(device, device_utils.DeviceUtils)
+    self.device = device
+    self.device_serial = self.device.adb.GetDeviceSerial()
     self.tool = CreateTool(tool, self.device)
     self._http_server = None
     self._forwarder_device_port = 8000