Remove a chrome dependency by removing Prerender from ResourceDispatcherHost.

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index 1bd5737892295d4009d84708559a809e2c627750..e1944bdde1a07a185060ec2e2a6a0c80e0591819 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -58,6 +58,10 @@ namespace net {
 class URLRequestContextGetter;
 }
 
+namespace prerender {
+class PrerenderTracker;
+}
+
 namespace printing {
 class BackgroundPrintingManager;
 class PrintJobManager;
@@ -221,6 +225,8 @@ class BrowserProcess {
 
   virtual ChromeNetLog* net_log() = 0;
 
+  virtual prerender::PrerenderTracker* prerender_tracker() = 0;
+
 #if defined(IPC_MESSAGE_LOG_ENABLED)
   // Enable or disable IPC logging for the browser, all processes
   // derived from ChildProcess (plugin etc), and all