Ensure previous test preference overrides are reset between tests

content/shell/browser/layout_test/blink_test_controller.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/shell/browser/layout_test/blink_test_controller.h"
 
 #include <stddef.h>
 
 #include <iostream>
 #include <set>
@@ skipping 297 matching lines @@
     main_window_->web_contents()
         ->GetRenderViewHost()
         ->GetWidget()
         ->WasResized();
     RenderViewHost* render_view_host =
         main_window_->web_contents()->GetRenderViewHost();
 
     // Compositing tests override the default preferences (see
     // BlinkTestController::OverrideWebkitPrefs) so we force them to be
     // calculated again to ensure is_compositing_test_ changes are picked up.
-    default_prefs_ = render_view_host->GetWebkitPreferences();
     OverrideWebkitPrefs(&default_prefs_);
 
     render_view_host->UpdateWebkitPreferences(default_prefs_);
     HandleNewRenderFrameHost(render_view_host->GetMainFrame());
 
     NavigationController::LoadURLParams params(test_url);
     params.transition_type = ui::PageTransitionFromInt(
         ui::PAGE_TRANSITION_TYPED | ui::PAGE_TRANSITION_FROM_ADDRESS_BAR);
     params.should_clear_history_list = true;
     main_window_->web_contents()->GetController().LoadURLWithParams(params);
@@ skipping 616 matching lines @@
   } else {
     printer_->AddErrorMessage(base::StringPrintf(
         "FAIL: Unexpected sendBluetoothManualChooserEvent() event name '%s'.",
         event_name.c_str()));
     return;
   }
   bluetooth_chooser_factory_->SendEvent(event, argument);
 }
 
 }  // namespace content