Make all the rest of the recipes explicitly specify GIT_MODE

scripts/slave/recipe_modules/pgo/api.py

Index: scripts/slave/recipe_modules/pgo/api.py
diff --git a/scripts/slave/recipe_modules/pgo/api.py b/scripts/slave/recipe_modules/pgo/api.py
index 95fda9fab58fef83ca1f784e3cb5922a7352cdac..009a15fd7a292c9a842bed583b741d435182cd68 100644
--- a/scripts/slave/recipe_modules/pgo/api.py
+++ b/scripts/slave/recipe_modules/pgo/api.py
@@ -103,7 +103,7 @@ class PGOApi(recipe_api.RecipeApi):
     Do a PGO build. This takes care of building an instrumented image, profiling
     it and then compiling the optimized version of it.
     """
-    self.m.gclient.set_config(bot_config['gclient_config'])
+    self.m.gclient.set_config(bot_config['gclient_config'], GIT_MODE=True)
 
     # Augment the solution if needed.
     self.m.gclient.c.solutions[0].url += bot_config.get('url_suffix', '')