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

chrome/browser/predictors/resource_prefetch_predictor_tab_helper.h

Index: chrome/browser/predictors/resource_prefetch_predictor_tab_helper.h
diff --git a/chrome/browser/predictors/resource_prefetch_predictor_tab_helper.h b/chrome/browser/predictors/resource_prefetch_predictor_tab_helper.h
deleted file mode 100644
index 4580bc8b623a96b00b026a871a263822aa24a0d4..0000000000000000000000000000000000000000
--- a/chrome/browser/predictors/resource_prefetch_predictor_tab_helper.h
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_TAB_HELPER_H_
-#define CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_TAB_HELPER_H_
-
-#include "content/public/browser/web_contents_observer.h"
-#include "content/public/browser/web_contents_user_data.h"
-
-namespace predictors {
-
-class ResourcePrefetchPredictorTabHelper
-    : public content::WebContentsObserver,
-      public content::WebContentsUserData<ResourcePrefetchPredictorTabHelper> {
- public:
-  virtual ~ResourcePrefetchPredictorTabHelper();
-
-  // content::WebContentsObserver implementation
-  virtual void DocumentOnLoadCompletedInMainFrame() OVERRIDE;
-  virtual void DidLoadResourceFromMemoryCache(
-      const content::LoadFromMemoryCacheDetails& details) OVERRIDE;
-
- private:
-  explicit ResourcePrefetchPredictorTabHelper(
-      content::WebContents* web_contents);
-  friend class content::WebContentsUserData<ResourcePrefetchPredictorTabHelper>;
-
-  DISALLOW_COPY_AND_ASSIGN(ResourcePrefetchPredictorTabHelper);
-};
-
-}  // namespace predictors
-
-#endif  // CHROME_BROWSER_PREDICTORS_RESOURCE_PREFETCH_PREDICTOR_TAB_HELPER_H_