Make *some* version of the Mac GN build work.

BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
@@ skipping 182 matching lines @@
       "//third_party/android_tools:android_support_v7_mediarouter_java",
       "//third_party/eyesfree:eyesfree_java",
     ]
 
     if (has_chrome_android_internal) {
       deps += [
         "//clank",
       ]
     }
 
+    # TODO(GYP): Move the targets in the rest of this block that still
+    # need to be made to work in the GN build to the bottom of the file
+    # so that all the remaining work is located in one place in the file.
+    # This block should contain only the targets that aren't actually
+    # needed on Android.
+
     deps -= [
       "//apps",  # Needs testing.
       "//chrome/browser",
       "//chrome/browser/devtools",
       "//chrome/common",
       "//chrome/plugin",
       "//chrome/renderer",
       "//chrome/test",
       "//chrome/tools",
       "//chrome/utility",
@@ skipping 40 matching lines @@
     ]
   }
 
   # Non-mobile builds.
   if (!is_android && !is_ios) {
     deps += [
       "//device/usb",
     ]
   }
 
+  # 
+  # TODO(GYP): Make everything below this work in the GN build.
+  #
+
+  if (is_mac) {
+    # TODO(dpranke): Need to fix the unused function errors in breakpad.
+    deps -= [
+      "//breakpad:symupload"
+    ]
+
+    # TODO(dpranke): These need a webrtc fix in order to build.
+    deps -= [
+      "//jingle:notifier",
+      "//third_party/libjingle",
+      "//third_party/webrtc",
+    ]
+
+    # TODO(dpranke): These depend on Blink and need Blink fixes to build.
+    deps -= [
+      "//cc/blink",
+      "//content",
+      "//content/test:test_support",
+      "//media/blink",
+      "//pdf",
+      "//ppapi:ppapi_c",
+      "//third_party/WebKit/public:all_blink",
+      "//ui/app_list",
+    ]
+
+    # TODO(dpranke): These are as-yet untriaged but need at least the above.
+    deps -= [
+      "//apps",
+      "//ash",
+      "//chrome/browser",
+      "//chrome/browser/devtools",
+      "//chrome/common",
+      "//chrome/plugin",
+      "//chrome/renderer",
+      "//chrome/test",
+      "//chrome/utility",
+      "//components:all_components",
+      "//content/shell:content_shell",
+      "//extensions/browser",
+      "//extensions/common",
+      "//extensions/common/api",
+      "//extensions/renderer",
+      "//remoting/client/plugin",
+      "//third_party/usrsctp",
+      "//ui/aura",
+      "//ui/keyboard",
+      "//ui/views",
+      "//ui/views/controls/webview",
+      "//ui/web_dialogs",
+    ]
+  }
+
   if (is_win) {
-    # TODO(GYP): Make these work.
     deps -= [
       "//apps",
       "//ash",
       "//chrome/browser",
       "//chrome/browser/devtools",
       "//chrome/common",
       "//chrome/plugin",
       "//chrome/renderer",
+      "//chrome/test",
       "//chrome/utility",
       "//components:all_components",
       "//cc",
       "//cc/blink",
       "//content",
       "//content/shell:content_shell",
       "//content/test:test_support",
       "//device/bluetooth",
       "//extensions/browser",
       "//extensions/common",
@@ skipping 33 matching lines @@
       "//ui/native_theme",
       "//ui/snapshot",
       "//ui/surface",
       "//ui/views",
       "//ui/views/controls/webview",
       "//ui/web_dialogs",
       "//ui/wm",
     ]
   }
 }