Printing: PDFs should only be fit to page if there is a size mismatch.

content/renderer/pepper/pepper_plugin_instance_impl.cc

Index: content/renderer/pepper/pepper_plugin_instance_impl.cc
diff --git a/content/renderer/pepper/pepper_plugin_instance_impl.cc b/content/renderer/pepper/pepper_plugin_instance_impl.cc
index 4e051349df677dd1cd701dbbb682effbd3b8a8b3..ecbd59cc64026947382033f25ba400230f5d1e7b 100644
--- a/content/renderer/pepper/pepper_plugin_instance_impl.cc
+++ b/content/renderer/pepper/pepper_plugin_instance_impl.cc
@@ -1837,6 +1837,10 @@ bool PepperPluginInstanceImpl::GetPrintPresetOptionsFromDocument(
       break;
   }
   preset_options->copies = options.copies;
+  preset_options->isPageSizeUniform = PP_ToBool(options.is_page_size_uniform);
+  preset_options->uniformPageSize =
+      blink::WebSize(options.uniform_page_size.width,
+                     options.uniform_page_size.height);
 
   return true;
 }