android buildbot: Don't cd into src/ by default.

build/android/buildbot/bb_utils.py

Index: build/android/buildbot/bb_utils.py
diff --git a/build/android/buildbot/bb_utils.py b/build/android/buildbot/bb_utils.py
index 3c16cc2bc5b243d4db1c7b1eeb8f3c5a948862c1..8eb6859075f5c854a232b1ac91594e8a29c006d3 100644
--- a/build/android/buildbot/bb_utils.py
+++ b/build/android/buildbot/bb_utils.py
@@ -36,7 +36,7 @@ def CommandToString(command):
   return ' '.join(map(pipes.quote, command))
 
 
-def SpawnCmd(command, stdout=None, cwd=CHROME_SRC):
+def SpawnCmd(command, stdout=None, cwd=None):
   """Spawn a process without waiting for termination."""
   print '>', CommandToString(command)
   sys.stdout.flush()
@@ -54,7 +54,7 @@ def SpawnCmd(command, stdout=None, cwd=CHROME_SRC):
 
 def RunCmd(command, flunk_on_failure=True, halt_on_failure=False,
            warning_code=constants.WARNING_EXIT_CODE, stdout=None,
-           cwd=CHROME_SRC):
+           cwd=None):
   """Run a command relative to the chrome source root."""
   code = SpawnCmd(command, stdout, cwd).wait()
   print '<', CommandToString(command)