Convert //chrome/browser/extensions from scoped_ptr to std::unique_ptr

chrome/browser/extensions/webstore_startup_installer.cc

Index: chrome/browser/extensions/webstore_startup_installer.cc
diff --git a/chrome/browser/extensions/webstore_startup_installer.cc b/chrome/browser/extensions/webstore_startup_installer.cc
index 7f0cdba16b1edb99d8885653ee5ed037f333e509..5dee0f42c510ada94606f520f41d67e8812a5a0d 100644
--- a/chrome/browser/extensions/webstore_startup_installer.cc
+++ b/chrome/browser/extensions/webstore_startup_installer.cc
@@ -4,6 +4,8 @@
 
 #include "chrome/browser/extensions/webstore_startup_installer.h"
 
+#include "base/memory/ptr_util.h"
+
 namespace extensions {
 
 WebstoreStartupInstaller::WebstoreStartupInstaller(
@@ -19,10 +21,10 @@ WebstoreStartupInstaller::WebstoreStartupInstaller(
 
 WebstoreStartupInstaller::~WebstoreStartupInstaller() {}
 
-scoped_ptr<ExtensionInstallPrompt::Prompt>
+std::unique_ptr<ExtensionInstallPrompt::Prompt>
 WebstoreStartupInstaller::CreateInstallPrompt() const {
   if (show_prompt_) {
-    return make_scoped_ptr(new ExtensionInstallPrompt::Prompt(
+    return base::WrapUnique(new ExtensionInstallPrompt::Prompt(
         ExtensionInstallPrompt::INSTALL_PROMPT));
   }
   return NULL;