Revert of Cleanup: Remove unused PrintSettings shrink factors.

components/printing/common/print_messages.h

Index: components/printing/common/print_messages.h
diff --git a/components/printing/common/print_messages.h b/components/printing/common/print_messages.h
index 2cbffeb882a5fa987da94306c9b95f65452ee1d2..6060a1c9a3896eb04b4881b8e15f594a22130978 100644
--- a/components/printing/common/print_messages.h
+++ b/components/printing/common/print_messages.h
@@ -42,6 +42,8 @@
   int margin_top;
   int margin_left;
   double dpi;
+  double min_shrink;
+  double max_shrink;
   int desired_dpi;
   int document_cookie;
   bool selection_only;
@@ -117,6 +119,12 @@
   // Specifies dots per inch.
   IPC_STRUCT_TRAITS_MEMBER(dpi)
 
+  // Minimum shrink factor. See PrintSettings::min_shrink for more information.
+  IPC_STRUCT_TRAITS_MEMBER(min_shrink)
+
+  // Maximum shrink factor. See PrintSettings::max_shrink for more information.
+  IPC_STRUCT_TRAITS_MEMBER(max_shrink)
+
   // Desired apparent dpi on paper.
   IPC_STRUCT_TRAITS_MEMBER(desired_dpi)