DNS Prefetch fix: renderer shouldn't send long hostnames to browser.

chrome/browser/net/predictor_browsertest.cc

Index: chrome/browser/net/predictor_browsertest.cc
diff --git a/chrome/browser/net/predictor_browsertest.cc b/chrome/browser/net/predictor_browsertest.cc
index 94d389ff2ac4065dbbc1863dafd942c65d8286ae..de11dfc6e39063844d769202e047833674c15e0f 100644
--- a/chrome/browser/net/predictor_browsertest.cc
+++ b/chrome/browser/net/predictor_browsertest.cc
@@ -54,6 +54,10 @@ class HostResolutionRequestRecorder : public net::HostResolverProc {
     return net::ERR_NAME_NOT_RESOLVED;
   }
 
+  int RequestedHostnameCount() const {
+    return requested_hostnames_.size();
+  }
+
   bool HasHostBeenRequested(const std::string& hostname) {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     return std::find(requested_hostnames_.begin(),
@@ -214,6 +218,10 @@ class PredictorBrowserTest : public InProcessBrowserTest {
     host_resolution_request_recorder_->WaitUntilHostHasBeenRequested(hostname);
   }
 
+  int RequestedHostnameCount() const {
+    return host_resolution_request_recorder_->RequestedHostnameCount();
+  }
+
   const GURL startup_url_;
   const GURL referring_url_;
   const GURL target_url_;
@@ -254,10 +262,12 @@ IN_PROC_BROWSER_TEST_F(PredictorBrowserTest, ShutdownStartupCycle) {
 
 IN_PROC_BROWSER_TEST_F(PredictorBrowserTest, DnsPrefetch) {
   ASSERT_TRUE(test_server()->Start());
+  int hostnames_requested_before_load = RequestedHostnameCount();
   ui_test_utils::NavigateToURL(
       browser(),
       GURL(test_server()->GetURL("files/predictor/dns_prefetch.html")));
   WaitUntilHostHasBeenRequested(kChromiumHostname);
+  ASSERT_EQ(hostnames_requested_before_load + 1, RequestedHostnameCount());
 }
 
 IN_PROC_BROWSER_TEST_F(PredictorBrowserTest, Preconnect) {