[tools/android] Replace FlagReplacer with flag_changer equivalent

tools/android/loading/controller.py

Index: tools/android/loading/controller.py
diff --git a/tools/android/loading/controller.py b/tools/android/loading/controller.py
index b15b62d05109fadf31bc0b2b5130f4b5dd1b33c6..0cad7f15c9b7db13f638f8c7f65af12834db1e22 100644
--- a/tools/android/loading/controller.py
+++ b/tools/android/loading/controller.py
@@ -40,6 +40,7 @@ _CATAPULT_DIR = os.path.join(_SRC_DIR, 'third_party', 'catapult')
 
 sys.path.append(os.path.join(_CATAPULT_DIR, 'devil'))
 from devil.android import device_errors
+from devil.android import flag_changer
 from devil.android.sdk import intent
 
 sys.path.append(
@@ -325,7 +326,7 @@ class RemoteChromeController(ChromeControllerBase):
           'Remote controller doesn\'t support chrome environment variables.'
     package_info = OPTIONS.ChromePackage()
     self._device.ForceStop(package_info.package)
-    with device_setup.FlagReplacer(
+    with flag_changer.CustomCommandLineFlags(
         self._device, package_info.cmdline_file, self._GetChromeArguments()):
       self._DismissCrashDialogIfNeeded()
       start_intent = intent.Intent(