Use actual value of display scale factor from GetMonitorScaleFactor().

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 367951acc517b810c354a23f9e2958c869927969..ca1f2aa9b9234c85a0af07ef53e23f171f3dfa26 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1021,6 +1021,8 @@ base::Closure WebContentsImpl::AddBindingSet(
 }
 
 void WebContentsImpl::UpdateDeviceScaleFactor(double device_scale_factor) {
+  LOG(ERROR) << "WebContentsImpl::UpdateDeviceScaleFactor("
+             << device_scale_factor << ")";
   SendPageMessage(
       new PageMsg_SetDeviceScaleFactor(MSG_ROUTING_NONE, device_scale_factor));
 }