Fix link error when safe browsing is disabled.

chrome/browser/memory_purger.cc

Index: chrome/browser/memory_purger.cc
diff --git a/chrome/browser/memory_purger.cc b/chrome/browser/memory_purger.cc
index 8e1d9a192c995375e90b01ca91f52a336ac15104..643050bf0fb4715d2bc47d9a5d4678539853f63e 100644
--- a/chrome/browser/memory_purger.cc
+++ b/chrome/browser/memory_purger.cc
@@ -37,7 +37,9 @@ 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(
@@ -49,7 +51,9 @@ class PurgeMemoryIOHelper
   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);
 };
@@ -67,7 +71,9 @@ void PurgeMemoryIOHelper::PurgeMemoryOnIOThread() {
         PurgeMemory();
   }
 
+#if defined(ENABLE_SAFE_BROWSING)
   safe_browsing_service_->PurgeMemory();
+#endif
 }
 
 // -----------------------------------------------------------------------------