Remove a site-per-process hack that is no longer needed.

content/browser/frame_host/navigator_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/browser/frame_host/navigator_impl.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 486 matching lines @@
           switches::kEnableBrowserSideNavigation)) {
     navigation_request_map_.erase(
         render_frame_host->frame_tree_node()->frame_tree_node_id());
   }
 
   FrameHostMsg_DidCommitProvisionalLoad_Params params(input_params);
   FrameTree* frame_tree = render_frame_host->frame_tree_node()->frame_tree();
   bool use_site_per_process = base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kSitePerProcess);
 
-  if (use_site_per_process) {
-    // TODO(creis): Until we mirror the frame tree in the subframe's process,
-    // cross-process subframe navigations happen in a renderer's main frame.
-    // Correct the transition type here if we know it is for a subframe.
-    NavigationEntryImpl* pending_entry =
-        NavigationEntryImpl::FromNavigationEntry(
-            controller_->GetPendingEntry());
-    if (!render_frame_host->frame_tree_node()->IsMainFrame() &&
-        pending_entry &&
-        pending_entry->frame_tree_node_id() ==
-            render_frame_host->frame_tree_node()->frame_tree_node_id()) {
-      params.transition = ui::PAGE_TRANSITION_AUTO_SUBFRAME;
-    }
-  }
-
   if (ui::PageTransitionIsMainFrame(params.transition)) {
     if (delegate_) {
       // When overscroll navigation gesture is enabled, a screenshot of the page
       // in its current state is taken so that it can be used during the
       // nav-gesture. It is necessary to take the screenshot here, before
       // calling RenderFrameHostManager::DidNavigateMainFrame, because that can
       // change WebContents::GetRenderViewHost to return the new host, instead
       // of the one that may have just been swapped out.
       if (delegate_->CanOverscrollContent()) {
         // Don't take screenshots if we are staying on the same page. We want
@@ skipping 449 matching lines @@
         "Navigation.TimeToCommit_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_commit);
     UMA_HISTOGRAM_TIMES(
         "Navigation.TimeToURLJobStart_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_network);
   }
   navigation_data_.reset();
 }
 
 }  // namespace content