Move "oauth2" manifest key parsing out of Extension class.

chrome/browser/extensions/extension_install_prompt.cc

Index: chrome/browser/extensions/extension_install_prompt.cc
===================================================================
--- chrome/browser/extensions/extension_install_prompt.cc	(revision 176209)
+++ chrome/browser/extensions/extension_install_prompt.cc	(working copy)
@@ -23,6 +23,7 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/common/chrome_switches.h"
+#include "chrome/common/extensions/api/identity/oauth2_manifest_handler.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_constants.h"
 #include "chrome/common/extensions/extension_icon_set.h"
@@ -593,9 +594,10 @@
     return;
   }
 
-  const Extension::OAuth2Info& oauth2_info = extension_->oauth2_info();
-  if (oauth2_info.client_id.empty() ||
-      oauth2_info.scopes.empty()) {
+  const extensions::OAuth2Info* oauth2_info =
+      extensions::OAuth2Info::GetOAuth2Info(extension_);
+  if (oauth2_info->client_id.empty() ||
+      oauth2_info->scopes.empty()) {
     ShowConfirmation();
     return;
   }
@@ -609,8 +611,8 @@
       OAuth2MintTokenFlow::Parameters(
           token_service->GetOAuth2LoginRefreshToken(),
           extension_->id(),
-          oauth2_info.client_id,
-          oauth2_info.scopes,
+          oauth2_info->client_id,
+          oauth2_info->scopes,
           OAuth2MintTokenFlow::MODE_ISSUE_ADVICE)));
   token_flow_->Start();
 }