Remove swapped-out usage in --site-per-process.

chrome/renderer/content_settings_observer.cc

 // Copyright (c) 2012 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 "chrome/renderer/content_settings_observer.h"
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "components/content_settings/content/common/content_settings_messages.h"
 #include "content/public/common/url_constants.h"
@@ skipping 152 matching lines @@
       allow_displaying_insecure_content_(false),
       allow_running_insecure_content_(false),
       content_setting_rules_(NULL),
       is_interstitial_page_(false),
       npapi_plugins_blocked_(false),
       current_request_id_(0),
       should_whitelist_(should_whitelist) {
   ClearBlockedContentSettings();
   render_frame->GetWebFrame()->setContentSettingsClient(this);
 
-  if (render_frame->GetRenderView()->GetMainRenderFrame() != render_frame) {
+  content::RenderFrame* main_frame =
+      render_frame->GetRenderView()->GetMainRenderFrame();
+  // TODO(nasko): The main frame is not guaranteed to be in the same process
+  // with this frame with --site-per-process. This code needs to be updated
+  // to handle this case. See https://crbug.com/496670.
+  if (main_frame && main_frame != render_frame) {
     // Copy all the settings from the main render frame to avoid race conditions
-    // when initializing this data. See http://crbug.com/333308.
-    ContentSettingsObserver* parent = ContentSettingsObserver::Get(
-        render_frame->GetRenderView()->GetMainRenderFrame());
+    // when initializing this data. See https://crbug.com/333308.
+    ContentSettingsObserver* parent = ContentSettingsObserver::Get(main_frame);
     allow_displaying_insecure_content_ =
         parent->allow_displaying_insecure_content_;
     allow_running_insecure_content_ = parent->allow_running_insecure_content_;
     temporarily_allowed_plugins_ = parent->temporarily_allowed_plugins_;
     is_interstitial_page_ = parent->is_interstitial_page_;
     npapi_plugins_blocked_ = parent->npapi_plugins_blocked_;
   }
 }
 
 ContentSettingsObserver::~ContentSettingsObserver() {
@@ skipping 523 matching lines @@
 
   // If the scheme is file:, an empty file name indicates a directory listing,
   // which requires JavaScript to function properly.
   if (EqualsASCII(origin.protocol(), url::kFileScheme)) {
     return document_url.SchemeIs(url::kFileScheme) &&
            document_url.ExtractFileName().empty();
   }
 
   return false;
 }