Mandoline: Move ContentHandlerConnection into separate file

mojo/shell/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("//third_party/mojo/src/mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 source_set("shell") {
   output_name = "mojo_shell"
   sources = [
     "application_loader.h",
     "application_manager.cc",
     "application_manager.h",
+    "content_handler_connection.cc",
+    "content_handler_connection.h",
     "data_pipe_peek.cc",
     "data_pipe_peek.h",
     "fetcher.cc",
     "fetcher.h",
     "identity.cc",
     "identity.h",
     "local_fetcher.cc",
     "local_fetcher.h",
     "native_runner.h",
     "network_fetcher.cc",
@@ skipping 44 matching lines @@
     "//testing/gtest",
     "//url",
   ]
 }
 
 mojom("test_bindings") {
   sources = [
     "test.mojom",
   ]
 }