Remove old prefetcher histogram code in render_frame_impl

content/renderer/render_frame_impl.cc

 // Copyright 2013 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.
 
 #include "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 3074 matching lines @@
       internal_data->set_is_overriding_user_agent(
           old_internal_data->is_overriding_user_agent());
     }
   }
 
   // The rest of RenderView assumes that a WebDataSource will always have a
   // non-null NavigationState.
   UpdateNavigationState(document_state, false /* was_within_same_page */,
                         content_initiated);
 
-  // DocumentState::referred_by_prefetcher_ is true if we are
-  // navigating from a page that used prefetching using a link on that
-  // page.  We are early enough in the request process here that we
-  // can still see the DocumentState of the previous page and set
-  // this value appropriately.
-  // TODO(gavinp): catch the important case of navigation in a new
-  // renderer process.
-  if (webview) {
-    if (WebFrame* old_frame = webview->mainFrame()) {
-      const WebURLRequest& original_request = datasource->originalRequest();
-      const GURL referrer(blink::WebStringToGURL(
-          original_request.httpHeaderField(WebString::fromUTF8("Referer"))));
-      if (!referrer.is_empty() && old_frame->isWebLocalFrame() &&
-          DocumentState::FromDataSource(old_frame->dataSource())
-              ->was_prefetcher()) {
-        for (; old_frame; old_frame = old_frame->traverseNext(false)) {
-          WebDataSource* old_frame_datasource = old_frame->dataSource();
-          if (old_frame_datasource &&
-              referrer == GURL(old_frame_datasource->request().url())) {
-            document_state->set_was_referred_by_prefetcher(true);
-            break;
-          }
-        }
-      }
-    }
-  }
-
   if (content_initiated) {
     const WebURLRequest& request = datasource->request();
     switch (request.getCachePolicy()) {
       case WebCachePolicy::UseProtocolCachePolicy:  // normal load.
         document_state->set_load_type(DocumentState::LINK_LOAD_NORMAL);
         break;
       case WebCachePolicy::ValidatingCacheData:  // reload.
       case WebCachePolicy::BypassingCache:       // end-to-end reload.
         document_state->set_load_type(DocumentState::LINK_LOAD_RELOAD);
         break;
@@ skipping 951 matching lines @@
   if (request.getLoFiState() == WebURLRequest::LoFiUnspecified) {
     if (is_main_frame_ && !navigation_state->request_committed()) {
       request.setLoFiState(static_cast<WebURLRequest::LoFiState>(
           navigation_state->common_params().lofi_state));
     } else {
       request.setLoFiState(
           is_using_lofi_ ? WebURLRequest::LoFiOn : WebURLRequest::LoFiOff);
     }
   }
 
-  // TODO(creis): Update prefetching to work with out-of-process iframes.
-  WebFrame* top_frame = frame->top();
-  if (top_frame && top_frame->isWebLocalFrame()) {
-    DocumentState* top_document_state =
-        DocumentState::FromDataSource(top_frame->dataSource());
-    if (top_document_state) {
-      // TODO(gavinp): separate out prefetching and prerender field trials
-      // if the rel=prerender rel type is sticking around.
-      if (request.getRequestContext() == WebURLRequest::RequestContextPrefetch)
-        top_document_state->set_was_prefetcher(true);
-    }
-  }
-
   // This is an instance where we embed a copy of the routing id
   // into the data portion of the message. This can cause problems if we
   // don't register this id on the browser side, since the download manager
   // expects to find a RenderViewHost based off the id.
   request.setRequestorID(render_view_->GetRoutingID());
   request.setHasUserGesture(WebUserGestureIndicator::isProcessingUserGesture());
 
   if (!navigation_state->start_params().extra_headers.empty()) {
     for (net::HttpUtil::HeadersIterator i(
              navigation_state->start_params().extra_headers.begin(),
@@ skipping 2249 matching lines @@
   // event target. Potentially a Pepper plugin will receive the event.
   // In order to tell whether a plugin gets the last mouse event and which it
   // is, we set |pepper_last_mouse_event_target_| to null here. If a plugin gets
   // the event, it will notify us via DidReceiveMouseEvent() and set itself as
   // |pepper_last_mouse_event_target_|.
   pepper_last_mouse_event_target_ = nullptr;
 #endif
 }
 
 }  // namespace content