Refactor chromium.perf recipe configs.

scripts/slave/recipe_modules/chromium_android/chromium_config.py

Index: scripts/slave/recipe_modules/chromium_android/chromium_config.py
diff --git a/scripts/slave/recipe_modules/chromium_android/chromium_config.py b/scripts/slave/recipe_modules/chromium_android/chromium_config.py
index 44bfaa6c324e1b20a7b617ad00857ff1093be106..d72a04d14b36fbe38bb0703005955321cc226ef1 100644
--- a/scripts/slave/recipe_modules/chromium_android/chromium_config.py
+++ b/scripts/slave/recipe_modules/chromium_android/chromium_config.py
@@ -196,14 +196,6 @@ def incremental_coverage_builder_tests(c):
 def non_device_wipe_provisioning(c):
   pass
 
-# TODO(zty): figure out what perf builder really wants and use that instead.
-# e.g. official
-@CONFIG_CTX(includes=['main_builder'])
-def perf(c):
-  gyp_defs = c.gyp_env.GYP_DEFINES
-  gyp_defs['branding'] = 'Chrome'
-  gyp_defs['buildtype'] = 'Official'
-
 @CONFIG_CTX(includes=['main_builder'])
 def cast_builder(c):
   c.gyp_env.GYP_DEFINES['chromecast'] = 1