When the user navigates to the home page, make sure to set the RLZ string

chrome/browser/instant/instant_loader.cc

Index: chrome/browser/instant/instant_loader.cc
===================================================================
--- chrome/browser/instant/instant_loader.cc	(revision 99286)
+++ chrome/browser/instant/instant_loader.cc	(working copy)
@@ -181,7 +181,8 @@
   // TabContentsDelegate:
   virtual void NavigationStateChanged(const TabContents* source,
                                       unsigned changed_flags) OVERRIDE;
-  virtual std::string GetNavigationHeaders(const GURL& url) OVERRIDE;
+  virtual void AddNavigationHeaders(const GURL& url,
+                                    std::string* headers) OVERRIDE;
   virtual bool ShouldFocusConstrainedWindow() OVERRIDE;
   virtual void WillShowConstrainedWindow(TabContents* source) OVERRIDE;
   virtual bool ShouldSuppressDialogs() OVERRIDE;
@@ -412,12 +413,11 @@
   }
 }
 
-std::string InstantLoader::TabContentsDelegateImpl::GetNavigationHeaders(
-    const GURL& url) {
-  std::string header;
+void InstantLoader::TabContentsDelegateImpl::AddNavigationHeaders(
+    const GURL& url,
+    std::string* headers) {
   net::HttpUtil::AppendHeaderIfMissing(kPreviewHeader, kPreviewHeaderValue,
-                                       &header);
-  return header;
+                                       headers);
 }
 
 bool InstantLoader::TabContentsDelegateImpl::ShouldFocusConstrainedWindow() {