cronet import: remove zlib from import

Test: run import
Change-Id: I51735fdbfee3118ec2529af7158611c25b34e79b
diff --git a/Cronet/tools/import/copy.bara.sky b/Cronet/tools/import/copy.bara.sky
index ee4e5f1..de46a86 100644
--- a/Cronet/tools/import/copy.bara.sky
+++ b/Cronet/tools/import/copy.bara.sky
@@ -97,7 +97,8 @@
         "third_party/protobuf/**",
         # Note: Only used for tests.
         "third_party/quic_trace/**",
-        "third_party/zlib/**",
+        # Note: Cronet currently uses Android's zlib
+        # "third_party/zlib/**",
         "url/third_party/mozilla/**",
     ],
     exclude = common_excludes,