[perf] Refactor chromium.perf.fyi recipe config to reuse chromium.perf code.

scripts/slave/recipe_modules/chromium/config.py

Index: scripts/slave/recipe_modules/chromium/config.py
diff --git a/scripts/slave/recipe_modules/chromium/config.py b/scripts/slave/recipe_modules/chromium/config.py
index 68031a3509d974f847973547bd01af344dc9a865..d6f9b1d0220878a26b8f1c8e4298b4a285d1139f 100644
--- a/scripts/slave/recipe_modules/chromium/config.py
+++ b/scripts/slave/recipe_modules/chromium/config.py
@@ -788,16 +788,6 @@ def v8_hybrid_arm(c):
 def enable_ipc_fuzzer(c):
   c.gyp_env.GYP_DEFINES['enable_ipc_fuzzer'] = 1
 
-@config_ctx(includes=['chromium', 'official', 'mb'])
-def chromium_perf(c):
-  c.clobber_before_runhooks = False
-
-@config_ctx(includes=['chromium_perf', 'goma_hermetic_fallback'])
-def tryserver_chromium_perf(c):
-  # Bisects may build using old toolchains, so goma_hermetic_fallback is
-  # required. See https://codereview.chromium.org/1015633002
-  pass
-
 @config_ctx(includes=['chromium_clang'])
 def cast_linux(c):
   c.gyp_env.GYP_DEFINES['chromecast'] = 1