Generalize Previews Type code

components/previews/core/previews_io_data.cc

Index: components/previews/core/previews_io_data.cc
diff --git a/components/previews/core/previews_io_data.cc b/components/previews/core/previews_io_data.cc
index 740e18f9e015fec835f9d1842007b77f53468bd9..496ef6dd69141a7c0af73634837ad38984b1c451 100644
--- a/components/previews/core/previews_io_data.cc
+++ b/components/previews/core/previews_io_data.cc
@@ -5,21 +5,20 @@
 #include "components/previews/core/previews_io_data.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/files/file_path.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/sequenced_task_runner.h"
 #include "base/time/default_clock.h"
 #include "components/previews/core/previews_black_list.h"
-#include "components/previews/core/previews_experiments.h"
 #include "components/previews/core/previews_opt_out_store.h"
 #include "components/previews/core/previews_ui_service.h"
 #include "net/nqe/network_quality_estimator.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_context.h"
 #include "url/gurl.h"
 
 namespace previews {
 
 PreviewsIOData::PreviewsIOData(
@@ -63,21 +62,21 @@ void PreviewsIOData::AddPreviewNavigation(const GURL& url,
 }
 
 void PreviewsIOData::ClearBlackList(base::Time begin_time,
                                     base::Time end_time) {
   DCHECK(io_task_runner_->BelongsToCurrentThread());
   previews_black_list_->ClearBlackList(begin_time, end_time);
 }
 
 bool PreviewsIOData::ShouldAllowPreview(const net::URLRequest& request,
                                         PreviewsType type) const {
-  if (!IsOfflinePreviewsEnabled())
+  if (!IsPreviewsTypeEnabled(type))
     return false;
   // The blacklist will disallow certain hosts for periods of time based on
   // user's opting out of the preview
   if (!previews_black_list_ ||
       !previews_black_list_->IsLoadedAndAllowed(request.url(), type)) {
     return false;
   }
   net::NetworkQualityEstimator* network_quality_estimator =
       request.context()->network_quality_estimator();
   if (!network_quality_estimator)