third_party/zlib: fix for "gn check"

compression_utils target include from //base and thus should depend
on it.

Checked on Linux with the following command line:

$ gn check --force gn-ninja-out/local-dbg --args='is_debug=true
is_component_build=true symbol_level=1' //third_party/zlib/*

BUG=367595

Change-Id: Ic2ebfc5ff441eae4f4b2a2c0a7eca7024e6fe33f
Reviewed-on: https://chromium-review.googlesource.com/508355


Commit-Queue: Thiago Farina <tfarina@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Satoru Takabayashi <satorux@google.com>
Reviewed-by: Matt Sarett <msarett@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#473187}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 3fe737215d4305f8766db04b2a4dfe15087b5b9a

BUILD.gn

@@ -160,6 +160,7 @@ if (build_with_chromium) {
     ]
     deps = [
       ":zlib",
+      "//base",
     ]
   }
 }