Remove most ScopedVector usage from c/b/extensions.

extensions/browser/management_policy.h

Index: extensions/browser/management_policy.h
diff --git a/extensions/browser/management_policy.h b/extensions/browser/management_policy.h
index 584af58bed94dde499f84f2e3eecd265c05af81c..cd0ec459f3215380a130ea9ca306d41ff92e1912 100644
--- a/extensions/browser/management_policy.h
+++ b/extensions/browser/management_policy.h
@@ -100,7 +100,8 @@ class ManagementPolicy {
   void UnregisterProvider(Provider* provider);
 
   // Like RegisterProvider(), but registers multiple providers instead.
-  void RegisterProviders(std::vector<Provider*> providers);
+  void RegisterProviders(
+      const std::vector<std::unique_ptr<Provider>>& providers);
 
   // Returns true if the user is permitted to install, load, and run the given
   // extension. If not, |error| may be set to an appropriate message.