Fix public_deps on compression_utils_portable.

As compression_utils_portable is been used by client code instead
of only internally in zlib helpers, there is the need to properly
export the right flags (i.e. header include paths) as some OSes
(e.g. Fuchsia) may have issues properly building/linking with zlib.

Bug: 1076580, 1087999
Change-Id: Ic54a55db40301dead92402e05c5da5613eb29c95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2228311Reviewed-by: Adenilson Cavalcanti <cavalcantii@chromium.org>
Commit-Queue: Adenilson Cavalcanti <cavalcantii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774767}

third_party/zlib/google/BUILD.gn

@@ -35,15 +35,6 @@ if (build_with_chromium) {
   }
 }
 
-# It seems that Fuchsia bot will fail to build if we don't explicitly
-# add this config as part of utils_portable.
-config("zlib_portable_utils_config") {
-  include_dirs = [
-    "//third_party/zlib",
-    "//third_party/zlib/google",
-  ]
-}
-
 # This allows other users of Chromium's zlib library, but don't use Chromium's
 # //base, to reuse some boilerplate code.
 static_library("compression_utils_portable") {
@@ -51,6 +42,5 @@ static_library("compression_utils_portable") {
     "compression_utils_portable.cc",
     "compression_utils_portable.h",
   ]
-  deps = [ "//third_party/zlib" ]
-  public_configs = [ ":zlib_portable_utils_config" ]
+  public_deps = [ "//third_party/zlib" ]
 }