Fix missing GN dependencies.

chrome/browser/BUILD.gn

 # 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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 # //build/config/android/rules.gni imports //tools/grit/grit_rule.gni, which
@@ skipping 834 matching lines @@
     "-E",
     "additional_modules_list_file=" +
         rebase_path(additional_modules_list_file, root_build_dir),
     "-E",
     "omnibox_mojom_file=" + rebase_path(omnibox_mojom_file, root_build_dir),
   ]
 
   deps = [
     ":about_credits",
     ":chrome_internal_resources_gen",
+
+    # Depend only on the generated mojo bindings since we read the .mojom.js
+    # file, rather than the whole mojo target which will link the C++ bindings.
+    "//chrome/browser/ui/webui/omnibox:mojo_bindings__generator",
   ]
   inputs = [
     omnibox_mojom_file,
   ]
 }
 
 # GYP version: chrome/chrome_resource.gyp:about_credits
 action("about_credits") {
   script = "//tools/licenses.py"
 
@@ skipping 275 matching lines @@
     ]
   }
 
   if (enable_wifi_bootstrapping) {
     sources += [
       "local_discovery/wifi/mock_wifi_manager.cc",
       "local_discovery/wifi/mock_wifi_manager.h",
     ]
   }
 }