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

extensions/browser/extensions_browser_client.cc

Index: extensions/browser/extensions_browser_client.cc
diff --git a/extensions/browser/extensions_browser_client.cc b/extensions/browser/extensions_browser_client.cc
index 5a917879f90e0941d87fbe7be130e228ee5fc527..690f5b14c8e7348b42eff361b1526576c07d4a7d 100644
--- a/extensions/browser/extensions_browser_client.cc
+++ b/extensions/browser/extensions_browser_client.cc
@@ -29,8 +29,9 @@ ExtensionsBrowserClient::CreateExtensionApiFrameIdMapHelper(
   return nullptr;
 }
 
-void ExtensionsBrowserClient::ReportError(content::BrowserContext* context,
-                                          scoped_ptr<ExtensionError> error) {
+void ExtensionsBrowserClient::ReportError(
+    content::BrowserContext* context,
+    std::unique_ptr<ExtensionError> error) {
   LOG(ERROR) << error->GetDebugString();
 }