Don't set "print selection" to false.

Before r231501 "print selection" was setup after InitPrintSettings. So reseting
to false was OK. Now option is already there so we need to keep it.

BUG=317851
NOTRY=true

Review URL: https://codereview.chromium.org/69033004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234444 0039d316-1c4b-4281-b951-d872f2087c98

printing/printing_context_mac.mm

@@ -186,7 +186,6 @@ void PrintingContextMac::InitPrintSettingsFromPrintInfo() {
       static_cast<PMPageFormat>([print_info_.get() PMPageFormat]);
   PMPrinter printer;
   PMSessionGetCurrentPrinter(print_session, &printer);
-  settings_.set_selection_only(false);
   PrintSettingsInitializerMac::InitPrintSettings(
       printer, page_format, &settings_);
 }