Revert "Remove 'mojo_' prefix from all mojo applications."

mojo/examples/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/ui.gni")
 
 assert(use_aura)
 
 shared_library("browser") {
+  output_name = "mojo_browser"
+
   sources = [
     "browser.cc",
   ]
 
   deps = [
     "//base",
     "//cc",
     "//mojo/application",
     "//mojo/aura",
     "//mojo/common",
@@ skipping 11 matching lines @@
     "//ui/aura",
     "//ui/base",
     "//ui/compositor",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/resources",
     "//ui/views",
     "//url",
   ]
 }