Revert of win/clang: Roll clang 239674:242130

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index e0eb8d299dbd74e668caa21044a147a142044dde..a0ebbf3564ced5abd48e92fc7e58540d37537308 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -2604,9 +2604,6 @@
 
         # TODO(hans): Get this cleaned up, http://crbug.com/428099
         '-Wno-inconsistent-missing-override',
-
-        # TODO(thakis): Enable this, crbug.com/507717
-        '-Wno-shift-negative-value',
       ],
     },
     'includes': [ 'set_clang_warning_flags.gypi', ],
@@ -3101,6 +3098,12 @@
       ['enable_wexit_time_destructors==1 and OS!="win"', {
         # TODO: Enable on Windows too, http://crbug.com/404525
         'variables': { 'clang_warning_flags': ['-Wexit-time-destructors']},
+      }],
+      ['"<!(python <(DEPTH)/tools/clang/scripts/update.py --print-revision)"!="239674-1"', {
+        # TODO(thakis): Move this to the global clang_warning_flags block once
+        # clang is rolled far enough that the pinned clang understands this flag
+        # TODO(thakis): Enable this, crbug.com/507717
+        'variables': { 'clang_warning_flags': ['-Wno-shift-negative-value']},
       }],
       ['chromium_code==0', {
         'variables': {