Cancel prerender when a site tries to register a protocol handler.

chrome/browser/prerender/prerender_browsertest.cc

Index: chrome/browser/prerender/prerender_browsertest.cc
===================================================================
--- chrome/browser/prerender/prerender_browsertest.cc	(revision 143870)
+++ chrome/browser/prerender/prerender_browsertest.cc	(working copy)
@@ -1398,6 +1398,13 @@
                    1);
 }
 
+// Checks that registering a protocol handler causes cancellation.
+IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderRegisterProtocolHandler) {
+  PrerenderTestURL("files/prerender/prerender_register_protocol_handler.html",
+                   FINAL_STATUS_REGISTER_PROTOCOL_HANDLER,
+                   1);
+}
+
 // Checks that renderers using excessive memory will be terminated.
 IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PrerenderExcessiveMemory) {
   ASSERT_TRUE(GetPrerenderManager());