Implement IsSearchProviderInstalled and a test for it.

chrome/browser/renderer_host/render_view_host_delegate.cc

Index: chrome/browser/renderer_host/render_view_host_delegate.cc
diff --git a/chrome/browser/renderer_host/render_view_host_delegate.cc b/chrome/browser/renderer_host/render_view_host_delegate.cc
index fcaf770a92e95f8105d4db34cdff4462eb2960db..c1a39553d67bb05eafb8c0c7a66a883d1aba4dd9 100644
--- a/chrome/browser/renderer_host/render_view_host_delegate.cc
+++ b/chrome/browser/renderer_host/render_view_host_delegate.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/renderer_host/render_view_host_delegate.h"
 
 #include "base/singleton.h"
+#include "chrome/common/render_messages.h"
 #include "chrome/common/renderer_preferences.h"
 #include "gfx/rect.h"
 #include "googleurl/src/gurl.h"
@@ -84,6 +85,11 @@ GURL RenderViewHostDelegate::GetAlternateErrorPageURL() const {
   return GURL();
 }
 
+ViewHostMsg_GetSearchProviderInstallState_Params
+RenderViewHostDelegate::GetSearchProviderInstallState(const GURL& url) {
+  return ViewHostMsg_GetSearchProviderInstallState_Params::Denied();
+}
+
 WebPreferences RenderViewHostDelegate::GetWebkitPrefs() {
   return WebPreferences();
 }