Don't supply value for boolean attribute

ui/accelerated_widget_mac/io_surface_context.mm

Index: ui/accelerated_widget_mac/io_surface_context.mm
diff --git a/ui/accelerated_widget_mac/io_surface_context.mm b/ui/accelerated_widget_mac/io_surface_context.mm
index 59e79fd847da94f4c6500f9a49b14281383011fe..7b0dcd1e314044bcb55bdaa52a8fd6dab2a5c4ca 100644
--- a/ui/accelerated_widget_mac/io_surface_context.mm
+++ b/ui/accelerated_widget_mac/io_surface_context.mm
@@ -35,10 +35,8 @@ IOSurfaceContext::Get(Type type) {
   std::vector<CGLPixelFormatAttribute> attribs;
   attribs.push_back(kCGLPFADepthSize);
   attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
-  if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus()) {
+  if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus())
     attribs.push_back(kCGLPFAAllowOfflineRenderers);
-    attribs.push_back(static_cast<CGLPixelFormatAttribute>(1));
-  }
   attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
   GLint number_virtual_screens = 0;
   base::ScopedTypeRef<CGLPixelFormatObj> pixel_format;