Simplified print preview printer selection to be more consistent with Chrome

printing/print_job_constants.cc

Index: printing/print_job_constants.cc
diff --git a/printing/print_job_constants.cc b/printing/print_job_constants.cc
index 0edea06abe467d8203fd34ad4c3fcefd8239d0fe..fa99f25f240ee9ea3cefa890e3c831fd87eb9a0c 100644
--- a/printing/print_job_constants.cc
+++ b/printing/print_job_constants.cc
@@ -18,6 +18,9 @@ const char kPreviewUIAddr[] = "previewUIAddr";
 // Print using cloud print: true if selected, false if not.
 const char kSettingCloudPrintId[] = "cloudPrintID";
 
+// Print using cloud print dialog: true if selected, false if not.
+const char kSettingCloudPrintDialog[] = "printWithCloudPrint";
+
 // Print job setting 'collate'.
 const char kSettingCollate[] = "collate";