Use the same Clang revision as v8 uses

Roll Clang revision to the same one as v8

TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1900603004
diff --git a/DEPS b/DEPS
index 465a190..425c71d 100644
--- a/DEPS
+++ b/DEPS
@@ -5,7 +5,7 @@
   'pdfium_git': 'https://pdfium.googlesource.com',
 
   'buildtools_revision': 'c2f259809d5ede3275df5ea0842f0431990c4f98',
-  'clang_revision': '87058e09f9c547eb5d00cb8ca666c6aec203a117',
+  'clang_revision': '9dc1904d214a77f081362c1b848b5f28d2192748',
   'cygwin_revision': 'c89e446b273697fadf3a10ff1007a97c0b7de6df',
   'gmock_revision': '29763965ab52f24565299976b936d1265cb6a271',
   'gtest_revision': '8245545b6dc9c4703e6496d1efd19e975ad2b038',