external/boringssl: Sync to 68f37b7a3f451aa1ca8c93669c024d01f6270ae8.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/3ef7697ed30f28367395a5aafb57a12a19906d96..68f37b7a3f451aa1ca8c93669c024d01f6270ae8

Test: cts-tradefed run cts -m CtsLibcoreOkHttpTestCases -a arm64-v8a
Test: cts-tradefed run cts -m CtsLibcoreTestCases -a arm64-v8a

Change-Id: I296d05afab7470335cdda2442414a858df591f6c
diff --git a/src/util/bot/DEPS b/src/util/bot/DEPS
index c57864c..0452d55 100644
--- a/src/util/bot/DEPS
+++ b/src/util/bot/DEPS
@@ -24,10 +24,15 @@
 deps_os = {
   'android': {
     'boringssl/util/bot/android_tools':
-      Var('chromium_git') + '/android_tools.git' + '@' + 'af1c5a4cd6329ccdcf8c2bc93d9eea02f9d74869',
+      Var('chromium_git') + '/android_tools.git' + '@' + 'c02a002b48d6637714ef98f0e4bf6952b9c4cf10',
   },
 }
 
+recursedeps = [
+  # android_tools pulls in the NDK from a separate repository.
+  'boringssl/util/bot/android_tools',
+]
+
 hooks = [
   {
     'name': 'cmake_linux64',