Include referrer chain with inline install requests

chrome/browser/extensions/webstore_standalone_installer.cc

Index: chrome/browser/extensions/webstore_standalone_installer.cc
diff --git a/chrome/browser/extensions/webstore_standalone_installer.cc b/chrome/browser/extensions/webstore_standalone_installer.cc
index 3809bdc358d75e99e8c54ecc239ab0d714c1995c..c2ac30c6c4ccb17f439800d7086b45c283ae7fa1 100644
--- a/chrome/browser/extensions/webstore_standalone_installer.cc
+++ b/chrome/browser/extensions/webstore_standalone_installer.cc
@@ -69,7 +69,7 @@ void WebstoreStandaloneInstaller::BeginInstall() {
       profile_->GetRequestContext(),
       GetRequestorURL(),
       id_));
-  webstore_data_fetcher_->Start();
+  OnBeforeWebstoreDataRequest(webstore_data_fetcher_.get());
 }
 
 //
@@ -159,6 +159,11 @@ void WebstoreStandaloneInstaller::InitInstallData(
   // Default implementation sets no properties.
 }
 
+void WebstoreStandaloneInstaller::OnBeforeWebstoreDataRequest(
+    WebstoreDataFetcher* fetcher) {
+  webstore_data_fetcher_->Start();
+}
+
 void WebstoreStandaloneInstaller::OnManifestParsed() {
   ProceedWithInstallPrompt();
 }