Roll src/third_party/boringssl/src 42e93b6cf..e9c7b1c8a

https://boringssl.googlesource.com/boringssl/+log/42e93b6cf5e0a5c958b6b59cf4842b3dc275561a..e9c7b1c8ae85e5625e9d24d9e20ccedeaaeb0d0a

BUG=none

Change-Id: I9ecae8f64a063214c536dcb150c687db31357d5e
Reviewed-on: https://chromium-review.googlesource.com/690398
Commit-Queue: Steven Valdez <svaldez@chromium.org>
Commit-Queue: David Benjamin <davidben@chromium.org>
Reviewed-by: David Benjamin <davidben@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505200}

DEPS

@@ -77,7 +77,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.
-  'boringssl_revision': '42e93b6cf5e0a5c958b6b59cf4842b3dc275561a',
+  'boringssl_revision': 'e9c7b1c8ae85e5625e9d24d9e20ccedeaaeb0d0a',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling google-toolbox-for-mac
   # and whatever else without interference from each other.