Decoupling rtc_base from apple specific code [without cyclic deps]

webrtc/rtc_tools/BUILD.gn

Index: webrtc/rtc_tools/BUILD.gn
diff --git a/webrtc/rtc_tools/BUILD.gn b/webrtc/rtc_tools/BUILD.gn
index fac42f389b48c89d6976572a0477878e75bcb8c1..bd94f93faff4e403b3c117f8de00b4c0a0d5799e 100644
--- a/webrtc/rtc_tools/BUILD.gn
+++ b/webrtc/rtc_tools/BUILD.gn
@@ -177,6 +177,9 @@ if (rtc_include_internal_audio_device) {
       "../system_wrappers:system_wrappers_default",
       "//build/win:default_exe_manifest",
     ]
+    if (is_ios) {
+      deps += [ "../rtc_base:rtc_base_apple" ]
+    }
   }
 }
 
@@ -249,6 +252,9 @@ if (rtc_include_tests) {
         "../test:field_trial",
         "../test:test_support",
       ]
+      if (is_ios) {
+        deps += [ "../rtc_base:rtc_base_apple" ]
+      }
     }
   }
 
@@ -272,6 +278,10 @@ if (rtc_include_tests) {
       "//build/win:default_exe_manifest",
       "//testing/gtest",
     ]
+
+    if (is_ios) {
+      deps += [ "../rtc_base:rtc_base_apple" ]
+    }
   }
 
   tools_unittests_resources = [
@@ -329,6 +339,9 @@ if (rtc_include_tests) {
     if (is_ios) {
       deps += [ ":tools_unittests_bundle_data" ]
     }
+    if (is_ios || is_mac) {
+      deps += [ "../rtc_base:rtc_base_apple" ]
+    }
   }
 
   if (rtc_enable_protobuf) {