[Android] Switch KillAll, StartActivity, and BroadcastIntent to DeviceUtils.

build/android/pylib/forwarder.py

Index: build/android/pylib/forwarder.py
diff --git a/build/android/pylib/forwarder.py b/build/android/pylib/forwarder.py
index aec572c9d42c0720882381101d83489877a6d61e..4f067def0daa4180570b22f271c02e67d2145694 100644
--- a/build/android/pylib/forwarder.py
+++ b/build/android/pylib/forwarder.py
@@ -340,8 +340,8 @@ class Forwarder(object):
     # sure that the old version of device_forwarder (not supporting
     # 'kill-server') is not running on the bots anymore.
     timeout_sec = 5
-    processes_killed = device.old_interface.KillAllBlocking(
-        'device_forwarder', timeout_sec)
+    processes_killed = device.KillAll(
+        'device_forwarder', blocking=True, timeout=timeout_sec)
     if not processes_killed:
       pids = device.old_interface.ExtractPid('device_forwarder')
       if pids: