Enable GN build on Mac.

build/config/mac/mac_sdk.gni

Index: build/config/mac/mac_sdk.gni
diff --git a/build/config/mac/mac_sdk.gni b/build/config/mac/mac_sdk.gni
index 54b68c40cacfb9ea541bae2c9c5db45a6ffabbed..b2a89e5c2a6d04323940347591de316f1a47a865 100644
--- a/build/config/mac/mac_sdk.gni
+++ b/build/config/mac/mac_sdk.gni
@@ -2,8 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/config/chrome_build.gni")
-
 declare_args() {
   # Minimum supported version of the Mac SDK.
   mac_sdk_min = "10.8"
@@ -14,16 +12,7 @@ declare_args() {
   mac_sdk_path = ""
 }
 
-find_sdk_args = [ "--print_sdk_path" ]
-if (is_chrome_branded && is_official_build) {
-  find_sdk_args += [
-    "--verify",
-    mac_sdk_min,
-    "--sdk_path=" + mac_sdk_path,
-  ]
-} else {
-  find_sdk_args += [ mac_sdk_min ]
-}
+find_sdk_args = [ "--print_sdk_path", mac_sdk_min ]
 
 # The tool will print the SDK path on the first line, and the version on the
 # second line.