Fix testGetVisitedHistoryCallbackAfterDestroy

content/renderer/render_thread_impl.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 "content/renderer/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <vector>
@@ skipping 1513 matching lines @@
                                params.route_id);
 }
 
 void RenderThreadImpl::OnMemoryPressure(
     base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
   base::allocator::ReleaseFreeMemory();
 
   // Trigger full v8 garbage collection on critical memory notification. This
   // will potentially hang the renderer for a long time, however, when we
   // receive a memory pressure notification, we might be about to be killed.
-  if (blink::mainThreadIsolate()) {
+  if (webkit_platform_support_ && blink::mainThreadIsolate()) {
     blink::mainThreadIsolate()->LowMemoryNotification();
   }
 
   if (memory_pressure_level ==
       base::MemoryPressureListener::MEMORY_PRESSURE_CRITICAL) {
     if (webkit_platform_support_) {
       // Clear the image cache. Do not call into blink if it is not initialized.
       blink::WebImageCache::clear();
     }
 
@@ skipping 68 matching lines @@
   hidden_widget_count_--;
 
   if (!GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden()) {
     return;
   }
 
   ScheduleIdleHandler(kLongIdleHandlerDelayMs);
 }
 
 }  // namespace content