Revert of [gn] Switch off gyp in runhooks by default

gypfiles/gyp_v8

Index: gypfiles/gyp_v8
diff --git a/gypfiles/gyp_v8 b/gypfiles/gyp_v8
index b62d185a42d008cb283161e06e621a2b77092736..8be39d961536f186e7da7d3440dd28d5e27055a6 100755
--- a/gypfiles/gyp_v8
+++ b/gypfiles/gyp_v8
@@ -118,17 +118,8 @@
 if __name__ == '__main__':
   args = sys.argv[1:]
 
-  gyp_chromium_no_action = os.environ.get('GYP_CHROMIUM_NO_ACTION')
-  if gyp_chromium_no_action == '1':
+  if int(os.environ.get('GYP_CHROMIUM_NO_ACTION', 0)):
     print 'Skipping gyp_v8 due to GYP_CHROMIUM_NO_ACTION env var.'
-    sys.exit(0)
-
-  running_as_hook = '--running-as-hook'
-  if running_as_hook in args and gyp_chromium_no_action != '0':
-    print 'GYP is now disabled by default in runhooks.\n'
-    print 'If you really want to run this, either run '
-    print '`python gypfiles/gyp_v8` explicitly by hand '
-    print 'or set the environment variable GYP_CHROMIUM_NO_ACTION=0.'
     sys.exit(0)
 
   gyp_environment.set_environment()