Make no-tcmalloc (really, non-base/allocator) builds work again,...

chrome/browser/memory_purger.cc

 // Copyright (c) 2009 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/browser/memory_purger.h"
 
 #include "base/thread.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/history/history.h"
@@ skipping 110 matching lines @@
   }
 
   ChromeThread::PostTask(ChromeThread::IO, FROM_HERE,
       NewRunnableMethod(purge_memory_io_helper.get(),
                         &PurgeMemoryIOHelper::PurgeMemoryOnIOThread));
 
   // TODO(pkasting):
   // * Purge AppCache memory.  Not yet implemented sufficiently.
   // * Browser-side DatabaseTracker.  Not implemented sufficiently.
 
-#if defined(OS_WIN)
+#if defined(OS_WIN) && defined(USE_TCMALLOC)
   // Tell tcmalloc to release any free pages it's still holding.
   //
   // TODO(pkasting): A lot of the above calls kick off actions on other threads.
   // Maybe we should find a way to avoid calling this until those actions
   // complete?
   MallocExtension::instance()->ReleaseFreeMemory();
 #endif
 }
 
 // static
 void MemoryPurger::PurgeRenderers() {
   // Direct all renderers to free everything they can.
   //
   // Concern: Telling a bunch of renderer processes to destroy their data may
   // cause them to page everything in to do it, which could take a lot of time/
   // cause jank.
   for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance())
     PurgeRendererForHost(i.GetCurrentValue());
 }
 
 // static
 void MemoryPurger::PurgeRendererForHost(RenderProcessHost* host) {
   // Direct the renderer to free everything it can.
   host->Send(new ViewMsg_PurgeMemory());
 }