Add test-only constructor for PageLoadExtraInfo.

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
diff --git a/chrome/browser/prerender/prerender_browsertest.cc b/chrome/browser/prerender/prerender_browsertest.cc
index df20cd020d12fc25da76bfc0856f6f0dc991aba5..991e8f7fb53b14a7baaf2865dffd66fb69a5d875 100644
--- a/chrome/browser/prerender/prerender_browsertest.cc
+++ b/chrome/browser/prerender/prerender_browsertest.cc
@@ -541,12 +541,8 @@ base::FilePath GetTestPath(const std::string& file_name) {
 
 page_load_metrics::PageLoadExtraInfo GenericPageLoadExtraInfo(
     const GURL& dest_url) {
-  return page_load_metrics::PageLoadExtraInfo(
-      base::TimeDelta(), base::TimeDelta(), false,
-      page_load_metrics::UserInitiatedInfo::BrowserInitiated(), dest_url,
-      dest_url, true /* did_commit */, page_load_metrics::END_NONE,
-      page_load_metrics::UserInitiatedInfo::NotUserInitiated(),
-      base::TimeDelta(), page_load_metrics::PageLoadMetadata());
+  return page_load_metrics::PageLoadExtraInfo::CreateForTesting(
+      dest_url, false /* started_in_foreground */);
 }
 
 }  // namespace