Fix running unittests on iOS simulator

webrtc/base/BUILD.gn

Index: webrtc/base/BUILD.gn
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index e94169d0ce45e641557d876c33bf0056e6a4e432..af7f4c3dcf8b2e7d2335f0c726f5e9ea3cb3e83a 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -730,9 +730,10 @@ rtc_source_set("rtc_base_tests_utils") {
 if (rtc_include_tests) {
   rtc_source_set("rtc_base_tests_main") {
     testonly = true
-    sources = [
-      "unittest_main.cc",
-    ]
+    sources = []
+    if (!is_ios) {
+      sources += [ "unittest_main.cc" ]
+    }
     public_configs = [ ":rtc_base_tests_utils_exported_config" ]
     deps = [
       ":rtc_base",
@@ -741,6 +742,12 @@ if (rtc_include_tests) {
       "../test:field_trial",
       "../test:test_support",
     ]
+
+    # TODO(oprypin): Bug 7758: integrate the iOS unittest support into WebRTC's
+    # unittest_main instead of replacing it with Chromium's main function.
+    if (is_ios) {
+      deps += [ "//base/test:run_all_unittests" ]
+    }
     public_deps = [
       "//testing/gmock",
       "//testing/gtest",