Revert of Add IGNORE_DEPS_CHANGES flag and coverage builder.

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 b329be79c629eb706f8b8cd3435d2836c51147de..fe33f80cc07ea25278cc0780d8c969d1a8a03805 100644
--- a/scripts/slave/recipe_modules/chromium/config.py
+++ b/scripts/slave/recipe_modules/chromium/config.py
@@ -71,7 +71,6 @@
       LLVM_FORCE_HEAD_REVISION = Single(basestring, required=False),
       GOMA_STUBBY_PROXY_IP_ADDRESS = Single(basestring, required=False),
       FORCE_MAC_TOOLCHAIN = Single(int, required=False),
-      IGNORE_DEPS_CHANGES = Single(bool, required=False),
     ),
     project_generator = ConfigGroup(
       tool = Single(basestring, empty_val='gyp'),
@@ -808,7 +807,3 @@
 @config_ctx()
 def build_angle_deqp_tests(c):
   c.gyp_env.GYP_DEFINES['build_angle_deqp_tests'] = 1
-
-@config_ctx()
-def ignore_deps_changes(c):
-  c.env.IGNORE_DEPS_CHANGES = True