Remove a chrome dependency by removing Prerender from ResourceDispatcherHost.

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index 7cf2253cf037b05a29002e4f29e7472b08cd5805..6f99274cee72e8308d808f2fe1774d7db6361869 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -11,6 +11,7 @@
 #include "base/metrics/histogram.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/browser_process.h"
 #include "chrome/browser/favicon/favicon_tab_helper.h"
 #include "chrome/browser/prerender/prerender_contents.h"
 #include "chrome/browser/prerender/prerender_final_status.h"
@@ -453,7 +454,7 @@ bool PrerenderManager::MaybeUsePreloadedPageOld(TabContents* tab_contents,
   // Try to set the prerendered page as used, so any subsequent attempts to
   // cancel on other threads will fail.  If this fails because the prerender
   // was already cancelled, possibly on another thread, fail.
-  if (!PrerenderTracker::GetInstance()->TryUse(child_id, route_id))
+  if (!g_browser_process->prerender_tracker()->TryUse(child_id, route_id))
     return false;
 
   if (!prerender_contents->load_start_time().is_null())
@@ -565,7 +566,7 @@ bool PrerenderManager::MaybeUsePreloadedPage(TabContents* tab_contents,
   // Try to set the prerendered page as used, so any subsequent attempts to
   // cancel on other threads will fail.  If this fails because the prerender
   // was already cancelled, possibly on another thread, fail.
-  if (!PrerenderTracker::GetInstance()->TryUse(child_id, route_id))
+  if (!g_browser_process->prerender_tracker()->TryUse(child_id, route_id))
     return false;
 
   if (!prerender_contents->load_start_time().is_null())