Remove a chrome dependency by removing Prerender from ResourceDispatcherHost.

chrome/browser/prerender/prerender_tracker_unittest.cc

Index: chrome/browser/prerender/prerender_tracker_unittest.cc
diff --git a/chrome/browser/prerender/prerender_tracker_unittest.cc b/chrome/browser/prerender/prerender_tracker_unittest.cc
index 4ed6f83e19a9f2a0a473a648dea68b9905e13010..61b2aca0418be32aac87e7a14fe12f70f43195f8 100644
--- a/chrome/browser/prerender/prerender_tracker_unittest.cc
+++ b/chrome/browser/prerender/prerender_tracker_unittest.cc
@@ -7,6 +7,7 @@
 #include "base/logging.h"
 #include "chrome/browser/prerender/prerender_manager.h"
 #include "chrome/browser/prerender/prerender_tracker.h"
+#include "chrome/test/testing_browser_process.h"
 #include "content/browser/browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -50,7 +51,7 @@ class PrerenderTrackerTest : public testing::Test {
   }
 
   PrerenderTracker* prerender_tracker() {
-    return PrerenderTracker::GetInstance();
+    return browser_process_.get()->prerender_tracker();
   }
 
   int GetCurrentStatus(int child_id, int route_id) {
@@ -68,6 +69,7 @@ class PrerenderTrackerTest : public testing::Test {
   }
 
  private:
+  ScopedTestingBrowserProcess browser_process_;
   MessageLoop message_loop_;
   BrowserThread ui_thread_;
   BrowserThread io_thread_;