[Android] Add a "quiet" flag so KillAll doesn't complain if no processes killed

build/android/pylib/gtest/test_package_exe.py

Index: build/android/pylib/gtest/test_package_exe.py
diff --git a/build/android/pylib/gtest/test_package_exe.py b/build/android/pylib/gtest/test_package_exe.py
index e607cad512aa90d06b7b60e698484f36fa634b0d..a1dc860805a4ca23edacf8a68eb0e7023cbbda6b 100644
--- a/build/android/pylib/gtest/test_package_exe.py
+++ b/build/android/pylib/gtest/test_package_exe.py
@@ -78,15 +78,7 @@ class TestPackageExecutable(TestPackage):
 
   #override
   def ClearApplicationState(self, device):
-    try:
-      # We don't expect the executable to be running, so we don't attempt
-      # to retry on failure.
-      device.KillAll(self.suite_name, blocking=True, timeout=30, retries=0)
-    except device_errors.CommandFailedError:
-      # KillAll raises an exception if it can't find a process with the given
-      # name. We only care that there is no process with the given name, so
-      # we can safely eat the exception.
-      pass
+    device.KillAll(self.suite_name, blocking=True, timeout=30, quiet=True)
 
   #override
   def CreateCommandLineFileOnDevice(self, device, test_filter, test_arguments):