Roll buildtools a114b81a60..b3771b1935 to pick up new clang-format binaries

  b3771b1935 Update clang-format binaries and scripts for all platforms.

BUG=695885
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Review-Url: https://codereview.chromium.org/2717993003 .
Cr-Commit-Position: refs/heads/master@{#453421}
diff --git a/DEPS b/DEPS
index c3250da..14d02c933 100644
--- a/DEPS
+++ b/DEPS
@@ -56,7 +56,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling build tools
   # and whatever else without interference from each other.
-  'buildtools_revision': 'a114b81a60affa28b3816d01791908e8f87a260d',
+  'buildtools_revision': 'b3771b1935ea74c388b6fb1750e83f5d83b39dec',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling SwiftShader
   # and whatever else without interference from each other.