Disable magnification palette tool unless experimental palette features are enabled.

ash/common/system/chromeos/palette/palette_tool.cc

Index: ash/common/system/chromeos/palette/palette_tool.cc
diff --git a/ash/common/system/chromeos/palette/palette_tool.cc b/ash/common/system/chromeos/palette/palette_tool.cc
index 204fa86f570341370c0ee7e2d519723edad15caa..9f50f8c5a516f0dde0607168ad629c454ae74c53 100644
--- a/ash/common/system/chromeos/palette/palette_tool.cc
+++ b/ash/common/system/chromeos/palette/palette_tool.cc
@@ -5,6 +5,7 @@
 #include "ash/common/system/chromeos/palette/palette_tool.h"
 
 #include "ash/common/system/chromeos/palette/palette_tool_manager.h"
+#include "ash/common/system/chromeos/palette/palette_utils.h"
 #include "ash/common/system/chromeos/palette/tools/capture_region_action.h"
 #include "ash/common/system/chromeos/palette/tools/capture_screen_action.h"
 #include "ash/common/system/chromeos/palette/tools/create_note_action.h"
@@ -19,7 +20,8 @@ void PaletteTool::RegisterToolInstances(PaletteToolManager* tool_manager) {
   tool_manager->AddTool(base::MakeUnique<CaptureRegionAction>(tool_manager));
   tool_manager->AddTool(base::MakeUnique<CaptureScreenAction>(tool_manager));
   tool_manager->AddTool(base::MakeUnique<CreateNoteAction>(tool_manager));
-  tool_manager->AddTool(base::MakeUnique<MagnifierMode>(tool_manager));
+  if (ArePaletteExperimentalFeaturesEnabled())
+    tool_manager->AddTool(base::MakeUnique<MagnifierMode>(tool_manager));
 }
 
 PaletteTool::PaletteTool(Delegate* delegate) : delegate_(delegate) {}