Move more client network code to //blimp/client/core/session.

blimp/client/core/session/BUILD.gn

 # Copyright 2016 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.
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
 
 source_set("session") {
   visibility = [
     "//blimp/client/*",
     "//blimp/engine:browser_tests",
   ]
 
   sources = [
     "assignment_source.cc",
     "assignment_source.h",
+    "client_network_components.cc",
+    "client_network_components.h",
+    "cross_thread_network_event_observer.cc",
+    "cross_thread_network_event_observer.h",
+    "network_event_observer.h",
   ]
 
   public_deps = [
     "//base",
+    "//blimp/net",
     "//components/safe_json",
     "//net",
     "//url",
   ]
 
   deps = [
     "//blimp/client/core:switches",
     "//blimp/common",
   ]
 }
@@ skipping 36 matching lines @@
 
 if (is_android) {
   java_cpp_enum("java_enums_srcjar") {
     visibility = [ "//blimp/client/*" ]
 
     sources = [
       "assignment_source.h",
     ]
   }
 }