Moved theme related state from BrowserInstantController to InstantService.

chrome/renderer/searchbox/searchbox_extension.cc

Index: chrome/renderer/searchbox/searchbox_extension.cc
diff --git a/chrome/renderer/searchbox/searchbox_extension.cc b/chrome/renderer/searchbox/searchbox_extension.cc
index 7c19aed40d61cd83545933382e28cbaab0d42c11..4b14ebb2a3e0f4d35fff88601e13af40cd5f93e2 100644
--- a/chrome/renderer/searchbox/searchbox_extension.cc
+++ b/chrome/renderer/searchbox/searchbox_extension.cc
@@ -906,11 +906,15 @@ void SearchBoxExtensionWrapper::GetDisplayInstantResults(
 void SearchBoxExtensionWrapper::GetThemeBackgroundInfo(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   content::RenderView* render_view = GetRenderView();
-  if (!render_view) return;
+  if (!render_view)
+    return;
 
   DVLOG(1) << render_view << " GetThemeBackgroundInfo";
   const ThemeBackgroundInfo& theme_info =
       SearchBox::Get(render_view)->GetThemeBackgroundInfo();
+  if (!theme_info.IsValid())
+    return;
+
   v8::Handle<v8::Object> info = v8::Object::New();
 
   // The theme background color is in RGBA format "rgba(R,G,B,A)" where R, G and
@@ -986,6 +990,8 @@ void SearchBoxExtensionWrapper::GetThemeBackgroundInfo(
       case THEME_BKGRND_IMAGE_REPEAT:
         tiling = kCSSBackgroundRepeat;
         break;
+      default:
+        NOTREACHED();
     }
     info->Set(v8::String::New("imageTiling"), UTF8ToV8String(tiling));