Refactor AO2TS to make it easier to componentize.

extensions/shell/browser/shell_oauth2_token_service.cc

Index: extensions/shell/browser/shell_oauth2_token_service.cc
diff --git a/extensions/shell/browser/shell_oauth2_token_service.cc b/extensions/shell/browser/shell_oauth2_token_service.cc
index a7422559c44b6142d385415c2d1f73d7f2d83fc2..b2a7c4ccebe1efa5ca9b3a919b2119684ac5b4d9 100644
--- a/extensions/shell/browser/shell_oauth2_token_service.cc
+++ b/extensions/shell/browser/shell_oauth2_token_service.cc
@@ -7,7 +7,7 @@
 #include "base/logging.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
-#include "google_apis/gaia/oauth2_access_token_fetcher_impl.h"
+#include "extensions/shell/browser/shell_oauth2_token_service_delegate.h"
 
 namespace extensions {
 namespace {
@@ -20,9 +20,9 @@ ShellOAuth2TokenService::ShellOAuth2TokenService(
     content::BrowserContext* browser_context,
     std::string account_id,
     std::string refresh_token)
-    : browser_context_(browser_context),
-      account_id_(account_id),
-      refresh_token_(refresh_token) {
+    : OAuth2TokenService(new ShellOAuth2TokenServiceDelegate(browser_context,
+                                                             account_id,
+                                                             refresh_token)) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(!g_instance);
   g_instance = this;
@@ -43,28 +43,11 @@ ShellOAuth2TokenService* ShellOAuth2TokenService::GetInstance() {
 void ShellOAuth2TokenService::SetRefreshToken(
     const std::string& account_id,
     const std::string& refresh_token) {
-  account_id_ = account_id;
-  refresh_token_ = refresh_token;
+  GetDelegate()->UpdateCredentials(account_id, refresh_token);
 }
 
-bool ShellOAuth2TokenService::RefreshTokenIsAvailable(
-    const std::string& account_id) const {
-  if (account_id != account_id_)
-    return false;
-
-  return !refresh_token_.empty();
-}
-
-OAuth2AccessTokenFetcher* ShellOAuth2TokenService::CreateAccessTokenFetcher(
-    const std::string& account_id,
-    net::URLRequestContextGetter* getter,
-    OAuth2AccessTokenConsumer* consumer) {
-  DCHECK(!refresh_token_.empty());
-  return new OAuth2AccessTokenFetcherImpl(consumer, getter, refresh_token_);
-}
-
-net::URLRequestContextGetter* ShellOAuth2TokenService::GetRequestContext() {
-  return browser_context_->GetRequestContext();
+std::string ShellOAuth2TokenService::AccountId() const {
+  return GetAccounts()[0];
 }
 
 }  // namespace extensions