Replace prepareToSuspend() with onMemoryStateChange(SUSPENDED)

third_party/WebKit/Source/core/fetch/Resource.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
     rights reserved.
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
@@ skipping 831 matching lines @@
     ResourceCallback::callbackHandler().cancel(this);
 
   // Prevent the case when there are clients waiting but no callback scheduled.
   DCHECK(m_clientsAwaitingCallback.isEmpty() || scheduled);
 }
 
 void Resource::prune() {
   destroyDecodedDataIfPossible();
 }
 
-void Resource::prepareToSuspend() {
+void Resource::onMemoryStateChange(MemoryState state) {
+  if (state != MemoryState::SUSPENDED)
+    return;
   prune();
   if (!m_cacheHandler)
     return;
   m_cacheHandler->clearCachedMetadata(CachedMetadataHandler::CacheLocally);
 }
 
 void Resource::onMemoryDump(WebMemoryDumpLevelOfDetail levelOfDetail,
                             WebProcessMemoryDump* memoryDump) const {
   static const size_t kMaxURLReportLength = 128;
   static const int kMaxResourceClientToShowInMemoryInfra = 10;
@@ skipping 242 matching lines @@
     case Resource::TextTrack:
     case Resource::Media:
     case Resource::Manifest:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace blink