Fix the definition of enable_perfetto_zlib flag

Change-Id: Iba461d2e04e90bd40193fca3e55226537555896c
diff --git a/gn/perfetto.gni b/gn/perfetto.gni
index c970450..a755b8c 100644
--- a/gn/perfetto.gni
+++ b/gn/perfetto.gni
@@ -289,7 +289,8 @@
   # Enables Zlib support. This is used both by the "perfetto" cmdline client
   # (for compressing traces) and by trace processor (for compressed traces).
   enable_perfetto_zlib =
-      enable_perfetto_trace_processor || enable_perfetto_platform_services
+      (enable_perfetto_trace_processor && !build_with_chromium) ||
+      enable_perfetto_platform_services
 }
 
 declare_args() {