Reset all members in PrintSettings::Clear.

printing/print_settings.cc

Index: printing/print_settings.cc
diff --git a/printing/print_settings.cc b/printing/print_settings.cc
index 4c1b3107389cd5bd4cae2a0c3c035ac24f4d5513..00e1ccef113d6b0eba314831c75e07cbf3f60be4 100644
--- a/printing/print_settings.cc
+++ b/printing/print_settings.cc
@@ -148,6 +148,7 @@ void PrintSettings::Clear() {
   page_setup_device_units_.Clear();
   dpi_ = 0;
   scale_factor_ = 1.0f;
+  rasterize_pdf_ = false;
   landscape_ = false;
   supports_alpha_blend_ = true;
 #if defined(OS_WIN)