Make safe browsing work in a multi-profile environment.

chrome/browser/profiles/profile_io_data.h

Index: chrome/browser/profiles/profile_io_data.h
===================================================================
--- chrome/browser/profiles/profile_io_data.h	(revision 91583)
+++ chrome/browser/profiles/profile_io_data.h	(working copy)
@@ -104,6 +104,10 @@
     return weak_extensions_request_context_.get();
   }
 
+  BooleanPrefMember* safe_browsing_enabled() const {
+    return &safe_browsing_enabled_;
+  }
+
  protected:
   friend class base::RefCountedThreadSafe<ProfileIOData>;
 
@@ -244,6 +248,9 @@
   mutable BooleanPrefMember enable_referrers_;
   mutable BooleanPrefMember clear_local_state_on_exit_;
 
+  // Member variables which are pointed to by the various context objects.
+  mutable BooleanPrefMember safe_browsing_enabled_;
+
   // Pointed to by URLRequestContext.
   mutable scoped_ptr<ChromeURLDataManagerBackend>
       chrome_url_data_manager_backend_;