Cleanup blimp/client/core code organization.

blimp/client/core/session/identity_source.cc

 // 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.
 
 #include "blimp/client/core/session/identity_source.h"
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
-#include "blimp/client/core/blimp_client_switches.h"
+#include "blimp/client/core/switches/blimp_client_switches.h"
 
 namespace blimp {
 namespace client {
 
 namespace {
 // OAuth2 token scope.
 const char kOAuth2TokenScope[] =
     "https://www.googleapis.com/auth/userinfo.email";
 
 // Max retry times when OAuth2 token request is canceled.
@@ skipping 118 matching lines @@
     OAuth2TokenService::ScopeSet scopes;
     scopes.insert(kOAuth2TokenScope);
     token_request_ = token_service->StartRequest(account_id_, scopes, this);
   } else {
     identity_provider_->AddActiveAccountRefreshTokenObserver(this);
   }
 }
 
 }  // namespace client
 }  // namespace blimp