Set landmine to clobber android trybots.

Fixing findbugs errors from incremental builds.

BUG=180079

Review URL: https://codereview.chromium.org/12390081

git-svn-id: http://src.chromium.org/svn/trunk/src/build@186053 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

landmines.py

@@ -140,7 +140,7 @@ def get_landmines(target):
       builder() == 'ninja'):
     add('Need to clobber winja goma due to backend cwd cache fix.')
   if platform() == 'android':
-    add('Clean android out directories to reduce zip size.')
+    add('Fix findbugs errors on android trybots.')
   if platform() == 'win' and builder() == 'ninja':
     add('Compile on cc_unittests fails due to symbols removed in r185063.')