Change the canonical way to include the C macros.h to <mojo/macros.h>.

mojo/public/tools/bindings/mojom.gni

 # Copyright 2014 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.
 
 # TODO(vardhan): Targets for each language bindings depend on a central
 # generator target which generates bindings for /every/ language. Create
 # separate generator targets for each language.
 
 import("../../mojo_sdk.gni")
 
@@ skipping 282 matching lines @@
     if (defined(invoker.visibility)) {
       visibility = invoker.visibility
     }
     if (defined(invoker.testonly)) {
       testonly = invoker.testonly
     }
 
     public_configs =
         rebase_path([ "mojo/public/build/config:mojo_sdk" ], ".", mojo_root)
 
-    public_deps = rebase_path([ "mojo/public/c/bindings" ], ".", mojo_root)
+    public_deps = rebase_path([
+                                "mojo/public/c",
+                                "mojo/public/c/bindings",
+                              ],
+                              ".",
+                              mojo_root)
     foreach(d, rebased_mojo_sdk_public_deps) {
       full_name = get_label_info(d, "label_no_toolchain")
       public_deps += [ "${full_name}_c" ]
     }
 
     deps = []
     foreach(d, rebased_mojo_sdk_deps) {
       # Resolve the name, so that a target //mojo/something becomes
       # //mojo/something:something and we can append "_c" to get the C
       # dependency name.
@@ skipping 249 matching lines @@
         # //mojo/something:something and we can append "_java" to get the java
         # dependency name.
         full_name = get_label_info(d, "label_no_toolchain")
         deps += [ "${full_name}_java" ]
       }
 
       srcjar_deps = [ ":$java_srcjar_target_name" ]
     }
   }
 }