recipes: Switch from 3 ways for requesting clobber builds to 1

scripts/slave/recipe_modules/chromium/api.py

Index: scripts/slave/recipe_modules/chromium/api.py
diff --git a/scripts/slave/recipe_modules/chromium/api.py b/scripts/slave/recipe_modules/chromium/api.py
index 3f30a642c558ac1dc1189d510fca686d42e9504d..8527749d74037478007efe05fb51b2eac6fbd335 100644
--- a/scripts/slave/recipe_modules/chromium/api.py
+++ b/scripts/slave/recipe_modules/chromium/api.py
@@ -155,7 +155,7 @@ class ChromiumApi(recipe_api.RecipeApi):
 
     return (buildername, bot_config)
 
-  def compile(self, targets=None, name=None, force_clobber=False, out_dir=None,
+  def compile(self, targets=None, name=None, out_dir=None,
               target=None, **kwargs):
     """Return a compile.py invocation."""
     targets = targets or self.c.compile_py.default_targets.as_jsonish()
@@ -220,8 +220,7 @@ class ChromiumApi(recipe_api.RecipeApi):
     if self.c.compile_py.ninja_confirm_noop:
       args.append('--ninja-ensure-up-to-date')
     if (self.m.properties.get('clobber') is not None or
-        self.c.compile_py.clobber or
-        force_clobber):
+        self.c.compile_py.clobber):
       args.append('--clobber')
     if self.c.compile_py.pass_arch_flag:
       args += ['--arch', self.c.gyp_env.GYP_DEFINES['target_arch']]