Revert CL 117933003. Re-add resource speculative prefetching code.

chrome/browser/profiles/profile_io_data.h

Index: chrome/browser/profiles/profile_io_data.h
diff --git a/chrome/browser/profiles/profile_io_data.h b/chrome/browser/profiles/profile_io_data.h
index 34fcb6451f40d5ef92382fb79f7861332491d0ab..ad9aaee78357fa4d56553e2705ad62ecee8cbbe2 100644
--- a/chrome/browser/profiles/profile_io_data.h
+++ b/chrome/browser/profiles/profile_io_data.h
@@ -42,6 +42,10 @@ class ProtocolHandlerRegistry;
 class SigninNamesOnIOThread;
 class SupervisedUserURLFilter;
 
+namespace chrome_browser_net {
+class ResourcePrefetchPredictorObserver;
+}
+
 namespace extensions {
 class InfoMap;
 }
@@ -228,6 +232,11 @@ class ProfileIOData {
     return &incognito_availibility_pref_;
   }
 
+  chrome_browser_net::ResourcePrefetchPredictorObserver*
+      resource_prefetch_predictor_observer() const {
+    return resource_prefetch_predictor_observer_.get();
+  }
+
 #if defined(ENABLE_CONFIGURATION_POLICY)
   policy::PolicyHeaderIOHelper* policy_header_helper() const {
     return policy_header_helper_.get();
@@ -310,6 +319,8 @@ class ProfileIOData {
 #if defined(ENABLE_EXTENSIONS)
     scoped_refptr<extensions::InfoMap> extension_info_map;
 #endif
+    scoped_ptr<chrome_browser_net::ResourcePrefetchPredictorObserver>
+        resource_prefetch_predictor_observer_;
 
     // This pointer exists only as a means of conveying a url job factory
     // pointer from the protocol handler registry on the UI thread to the
@@ -601,6 +612,9 @@ class ProfileIOData {
 
   mutable scoped_refptr<HostContentSettingsMap> host_content_settings_map_;
 
+  mutable scoped_ptr<chrome_browser_net::ResourcePrefetchPredictorObserver>
+      resource_prefetch_predictor_observer_;
+
   mutable scoped_ptr<ChromeHttpUserAgentSettings>
       chrome_http_user_agent_settings_;