[android] Clean up a couple of unnecessary test runner log warnings.

build/android/pylib/valgrind_tools.py

Index: build/android/pylib/valgrind_tools.py
diff --git a/build/android/pylib/valgrind_tools.py b/build/android/pylib/valgrind_tools.py
index 81428939f52d14ce22be8c990a554929e8e49964..986d0cb3eeb733c76e15a8748bfcc8ad2329f91d 100644
--- a/build/android/pylib/valgrind_tools.py
+++ b/build/android/pylib/valgrind_tools.py
@@ -20,7 +20,7 @@ def SetChromeTimeoutScale(device, scale):
   path = '/data/local/tmp/chrome_timeout_scale'
   if not scale or scale == 1.0:
     # Delete if scale is None/0.0/1.0 since the default timeout scale is 1.0
-    device.RunShellCommand('rm %s' % path)
+    device.RemovePath(path, force=True, as_root=True)
   else:
     device.WriteFile(path, '%f' % scale, as_root=True)