[Android] Clean up old_interface in build/android/.

build/android/pylib/device/device_utils.py

Index: build/android/pylib/device/device_utils.py
diff --git a/build/android/pylib/device/device_utils.py b/build/android/pylib/device/device_utils.py
index 9f538e1b0efd9f51ffaa4c1345febe8149edccc6..e9dc9b71738c10568a18168c0764489744dff275 100644
--- a/build/android/pylib/device/device_utils.py
+++ b/build/android/pylib/device/device_utils.py
@@ -72,6 +72,17 @@ _CONTROL_CHARGING_COMMANDS = [
   },
 ]
 
+# This must be done in a single shell command.
+_RESTART_ADBD_SCRIPT = """
+    function restart() {
+      stop adbd
+      start adbd
+    }
+
+    restart &
+"""
+
+
 @decorators.WithExplicitTimeoutAndRetries(
     _DEFAULT_TIMEOUT, _DEFAULT_RETRIES)
 def GetAVDs():
@@ -382,6 +393,12 @@ class DeviceUtils(object):
     if wifi:
       timeout_retry.WaitFor(wifi_enabled)
 
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def RestartAdbd(self, timeout=None, retries=None):
+    self.RunShellCommand(['sh', '-c', _RESTART_ADBD_SCRIPT],
+                         as_root=True, check_return=True)
+    self.adb.WaitForDevice()
+
   REBOOT_DEFAULT_TIMEOUT = 10 * _DEFAULT_TIMEOUT
   REBOOT_DEFAULT_RETRIES = _DEFAULT_RETRIES