DEPS: Bump snappy and enable more compilation warnings.

BUG=

Review-Url: https://codereview.chromium.org/2750713002
Cr-Commit-Position: refs/heads/master@{#456981}
diff --git a/DEPS b/DEPS
index c60474c..302891f 100644
--- a/DEPS
+++ b/DEPS
@@ -163,7 +163,7 @@
     Var('chromium_git') + '/external/leveldb.git' + '@' + 'a53934a3ae1244679f812d998a4f16f2c7f309a6',
 
   'src/third_party/snappy/src':
-    Var('chromium_git') + '/external/github.com/google/snappy.git' + '@' + '1cd3ab02e9dcbc1b76781530fb4981e4eac61b50',
+    Var('chromium_git') + '/external/github.com/google/snappy.git' + '@' + '8b60aac4fdbbb8f1dcce778accb5c04136c3a908',
 
   'src/tools/gyp':
     Var('chromium_git') + '/external/gyp.git' + '@' + 'e7079f0e0e14108ab0dba58728ff219637458563',