Fix link error when safe browsing is disabled.

chrome/browser/memory_purger.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/browser/memory_purger.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/threading/thread.h"
@@ skipping 19 matching lines @@
 
 // PurgeMemoryHelper -----------------------------------------------------------
 
 // This is a small helper class used to ensure that the objects we want to use
 // on multiple threads are properly refed, so they don't get deleted out from
 // under us.
 class PurgeMemoryIOHelper
     : public base::RefCountedThreadSafe<PurgeMemoryIOHelper> {
  public:
   PurgeMemoryIOHelper() {
+#if defined(ENABLE_SAFE_BROWSING)

[jam, 2012/03/27 19:18:35]

i think the first two ifdef's aren't needed. in general we try to keep ifdefs to
a minimum

[Iain Merrick, 2012/03/28 10:25:43]

Done.

     safe_browsing_service_ = g_browser_process->safe_browsing_service();
+#endif
   }
 
   void AddRequestContextGetter(
       scoped_refptr<net::URLRequestContextGetter> request_context_getter);
 
   void PurgeMemoryOnIOThread();
 
  private:
   typedef scoped_refptr<net::URLRequestContextGetter> RequestContextGetter;
 
   std::vector<RequestContextGetter> request_context_getters_;
+#if defined(ENABLE_SAFE_BROWSING)
   scoped_refptr<SafeBrowsingService> safe_browsing_service_;
+#endif
 
   DISALLOW_COPY_AND_ASSIGN(PurgeMemoryIOHelper);
 };
 
 void PurgeMemoryIOHelper::AddRequestContextGetter(
     scoped_refptr<net::URLRequestContextGetter> request_context_getter) {
   request_context_getters_.push_back(request_context_getter);
 }
 
 void PurgeMemoryIOHelper::PurgeMemoryOnIOThread() {
   // Ask ProxyServices to purge any memory they can (generally garbage in the
   // wrapped ProxyResolver's JS engine).
   for (size_t i = 0; i < request_context_getters_.size(); ++i) {
     request_context_getters_[i]->GetURLRequestContext()->proxy_service()->
         PurgeMemory();
   }
 
+#if defined(ENABLE_SAFE_BROWSING)
   safe_browsing_service_->PurgeMemory();
+#endif
 }
 
 // -----------------------------------------------------------------------------
 
 // static
 void MemoryPurger::PurgeAll() {
   PurgeBrowser();
   PurgeRenderers();
 
   // TODO(pkasting):
@@ skipping 65 matching lines @@
           content::RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance())
     PurgeRendererForHost(i.GetCurrentValue());
 }
 
 // static
 void MemoryPurger::PurgeRendererForHost(content::RenderProcessHost* host) {
   // Direct the renderer to free everything it can.
   host->Send(new ChromeViewMsg_PurgeMemory());
 }