Convert visitedlink to use mojo.

chrome/renderer/chrome_content_renderer_client.h

Index: chrome/renderer/chrome_content_renderer_client.h
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index 006177073f641744a8c556a0b87ea658286412bf..2a834f1936f6eafa12b49864c248c30ba0cc0052 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -62,10 +62,6 @@ namespace subresource_filter {
 class RulesetDealer;
 }
 
-namespace visitedlink {
-class VisitedLinkSlave;
-}
-
 namespace web_cache {
 class WebCacheImpl;
 }
@@ -240,7 +236,6 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
 #if defined(ENABLE_SPELLCHECK)
   std::unique_ptr<SpellCheck> spellcheck_;
 #endif
-  std::unique_ptr<visitedlink::VisitedLinkSlave> visited_link_slave_;
   std::unique_ptr<safe_browsing::PhishingClassifierFilter> phishing_classifier_;
   std::unique_ptr<subresource_filter::RulesetDealer>
       subresource_filter_ruleset_dealer_;