Move impl of identity.GetAccounts() extension API to its own file

chrome/browser/extensions/api/identity/identity_api.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_IDENTITY_IDENTITY_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_IDENTITY_IDENTITY_API_H_
 
 #include <map>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "build/build_config.h"
 #include "chrome/browser/extensions/api/identity/extension_token_key.h"
 #include "chrome/browser/extensions/api/identity/gaia_web_auth_flow.h"
+#include "chrome/browser/extensions/api/identity/identity_get_accounts_function.h"
 #include "chrome/browser/extensions/api/identity/identity_get_auth_token_function.h"
 #include "chrome/browser/extensions/api/identity/identity_get_profile_user_info_function.h"
 #include "chrome/browser/extensions/api/identity/identity_launch_web_auth_flow_function.h"
 #include "chrome/browser/extensions/api/identity/identity_mint_queue.h"
 #include "chrome/browser/extensions/api/identity/identity_remove_cached_auth_token_function.h"
 #include "chrome/browser/extensions/api/identity/identity_signin_flow.h"
 #include "chrome/browser/extensions/api/identity/web_auth_flow.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
 #include "components/signin/core/browser/profile_identity_provider.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
@@ skipping 95 matching lines @@
   ProfileIdentityProvider profile_identity_provider_;
   gaia::AccountTracker account_tracker_;
 
   // May be null.
   IdentityGetAuthTokenFunction* get_auth_token_function_;
 };
 
 template <>
 void BrowserContextKeyedAPIFactory<IdentityAPI>::DeclareFactoryDependencies();
 
-class IdentityGetAccountsFunction : public ChromeUIThreadExtensionFunction {
- public:
-  DECLARE_EXTENSION_FUNCTION("identity.getAccounts",
-                             IDENTITY_GETACCOUNTS);
-
-  IdentityGetAccountsFunction();
-
- private:
-  ~IdentityGetAccountsFunction() override;
-
-  // UIThreadExtensionFunction implementation.
-  ExtensionFunction::ResponseAction Run() override;
-};
-
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_IDENTITY_IDENTITY_API_H_