Updating the CLD3 commit hash in DEPS

The main change is static_cast-ing a few chars in ported code to
unsigned chars because on some platforms by default char is signed,
on others it's unsigned.

GitHub page showing the diff:
https://github.com/google/cld3/commit/ae02d6b8a2af41e87c956c7c7d3f651a8b7b9e79

BUG=

Review-Url: https://codereview.chromium.org/2627143002
Cr-Commit-Position: refs/heads/master@{#443146}

DEPS

@@ -270,7 +270,7 @@ deps = {
     Var('chromium_git') + '/external/github.com/CLD2Owners/cld2.git' + '@' + '84b58a5d7690ebf05a91406f371ce00c3daf31c0',
 
   'src/third_party/cld_3/src':
-    Var('chromium_git') + '/external/github.com/google/cld_3.git' + '@' + 'c03368eff92acc56756df2d4cd74a01a674409ea',
+    Var('chromium_git') + '/external/github.com/google/cld_3.git' + '@' + 'ae02d6b8a2af41e87c956c7c7d3f651a8b7b9e79',
 
   'src/third_party/libwebm/source':
     Var('chromium_git') + '/webm/libwebm.git' + '@' + '9a235e0bc94319c5f7184bd69cbe5468a74a025c',