Use 'public_deps' to depend on nacl_io [1].

Some NaCl system headers live in a special directory and the
toolchain doesn't propagate the -I compiler flag [2].

A common workaround in Chromium is to use 'public_deps' in order
to propagate //native_client_sdk/src/libraries/nacl_io:nacl_io_include_dirs
one step further in the build graph.

[1] - https://cs.chromium.org/chromium/src/native_client_sdk/src/libraries/nacl_io/
[2] - -Inative_client_sdk/src/libraries/third_party/newlib-extras

Bug: chromium:925028
Change-Id: I5145b80c2ae6969f79fcbfcf93a6b05c8a122746
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/129701
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27373}
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index 3b9fac4..2cc45d5 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -88,6 +88,7 @@
     "//third_party/abseil-cpp/absl/memory",
     "//third_party/abseil-cpp/absl/types:optional",
   ]
+  public_deps = []  # no-presubmit-check TODO(webrtc:8603)
 
   sources = [
     "bind.h",
@@ -149,14 +150,14 @@
   }
 
   if (is_nacl) {
-    deps += [ "//native_client_sdk/src/libraries/nacl_io" ]
+    public_deps += [ "//native_client_sdk/src/libraries/nacl_io" ]  # no-presubmit-check TODO(webrtc:8603)
   }
 
   if (is_android) {
     libs = [ "log" ]
   }
 
-  public_deps = [  # no-presubmit-check TODO(webrtc:8603)
+  public_deps += [  # no-presubmit-check TODO(webrtc:8603)
     ":atomicops",
     ":criticalsection",
     ":logging",
@@ -1006,7 +1007,7 @@
   }
 
   if (is_nacl) {
-    deps += [ "//native_client_sdk/src/libraries/nacl_io" ]
+    public_deps += [ "//native_client_sdk/src/libraries/nacl_io" ]  # no-presubmit-check TODO(webrtc:8603)
     defines += [ "timezone=_timezone" ]
     sources -= [ "ifaddrs_converter.cc" ]
   }