Enforce the 'requirements' field in manifests.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index c2b00899bc23aaffef231cdb48ba417fcc997b47..ab397b8ee85d247ae6d35d8cafd61b7e5631a83f 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -84,6 +84,7 @@ class Extension;
 class ExtensionCookiesEventRouter;
 class ExtensionSyncData;
 class ExtensionUpdater;
+class RequirementsProvider;
 class SettingsFrontend;
 class WebNavigationEventRouter;
 }
@@ -851,6 +852,9 @@ class ExtensionService
 
   scoped_ptr<ExtensionGlobalError> extension_global_error_;
 
+  // The provider that checks if the extension is supported.
+  scoped_ptr<extensions::RequirementsProvider> requirements_provider_;
+
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,