Get 'gn_all' building on iOS

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 2d4e60f4d84fa9660fab9c73a5070399dc235b30..da43acbdd524ec9189b0c9516cdf11129e8736b0 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -12,6 +12,7 @@ import("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
+import("//build_overrides/webrtc.gni")
 import("//media/media_options.gni")
 
 if (is_android) {
@@ -203,17 +204,22 @@ group("both_gn_and_gyp") {
     ]
   } else {
     deps += [
-      "//ios/chrome:ios_chrome_unittests",
-      "//ios/chrome/app",
-      "//ios/chrome/browser",
-      "//ios/chrome/common",
       "//ios/net:ios_net_unittests",
-      "//ios/public/provider/chrome/browser",
       "//ios/public/provider/web",
       "//ios/testing:ocmock_support_unittest",
       "//ios/web:ios_web_unittests",
       "//ios/web/shell:ios_web_shell",
     ]
+
+    if (ios_use_webrtc) {
+      deps += [
+        "//ios/chrome:ios_chrome_unittests",
+        "//ios/chrome/app",
+        "//ios/chrome/browser",
+        "//ios/chrome/common",
+        "//ios/public/provider/chrome/browser",
+      ]
+    }
   }
 
   deps += root_extra_deps