Convert //extensions/renderer from scoped_ptr to std::unique_ptr

extensions/renderer/extension_injection_host.cc

Index: extensions/renderer/extension_injection_host.cc
diff --git a/extensions/renderer/extension_injection_host.cc b/extensions/renderer/extension_injection_host.cc
index 6e5b042287138889982ba380a8038b932c903a83..85207c3a549bfaf0d0a0761d9fcd8e9467fc6141 100644
--- a/extensions/renderer/extension_injection_host.cc
+++ b/extensions/renderer/extension_injection_host.cc
@@ -23,13 +23,13 @@ ExtensionInjectionHost::~ExtensionInjectionHost() {
 }
 
 // static
-scoped_ptr<const InjectionHost> ExtensionInjectionHost::Create(
+std::unique_ptr<const InjectionHost> ExtensionInjectionHost::Create(
     const std::string& extension_id) {
   const Extension* extension =
       RendererExtensionRegistry::Get()->GetByID(extension_id);
   if (!extension)
-    return scoped_ptr<const ExtensionInjectionHost>();
-  return scoped_ptr<const ExtensionInjectionHost>(
+    return std::unique_ptr<const ExtensionInjectionHost>();
+  return std::unique_ptr<const ExtensionInjectionHost>(
       new ExtensionInjectionHost(extension));
 }