Default zoom was never read from chrome://settings

chrome/test/base/testing_profile.cc

Index: chrome/test/base/testing_profile.cc
diff --git a/chrome/test/base/testing_profile.cc b/chrome/test/base/testing_profile.cc
index 2f540caa5e8191ed0db30fe0e70b07a57131821f..f5585b05bf1045cdf9e22cab4e01e149c5c869c3 100644
--- a/chrome/test/base/testing_profile.cc
+++ b/chrome/test/base/testing_profile.cc
@@ -61,6 +61,7 @@
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/storage_partition.h"
+#include "content/public/browser/zoom_level_delegate.h"
 #include "content/public/test/mock_resource_context.h"
 #include "content/public/test/test_utils.h"
 #include "extensions/common/constants.h"
@@ -636,7 +637,8 @@ base::FilePath TestingProfile::GetPath() const {
 
 scoped_ptr<content::ZoomLevelDelegate> TestingProfile::CreateZoomLevelDelegate(
     const base::FilePath& partition_path) {
-  return nullptr;
+  return make_scoped_ptr(
+      new chrome::ChromeZoomLevelPrefs(GetPrefs(), GetPath(), partition_path));
 }
 
 scoped_refptr<base::SequencedTaskRunner> TestingProfile::GetIOTaskRunner() {
@@ -769,6 +771,11 @@ PrefService* TestingProfile::GetPrefs() {
   return prefs_.get();
 }
 
+chrome::ChromeZoomLevelPrefs* TestingProfile::GetZoomLevelPrefs() {
+  return static_cast<chrome::ChromeZoomLevelPrefs*>(
+      GetDefaultStoragePartition(this)->GetZoomLevelDelegate());
+}
+
 history::TopSites* TestingProfile::GetTopSites() {
   return top_sites_.get();
 }