When printing a PDF, query and use the print scaling disabled option.  Also, some general clean ups.

BUG=67091, 92045, 92218
TEST=Print a PDF with print scaling disabled and see that it takes up the entire page.


Review URL: http://codereview.chromium.org/8312003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@105893 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/printing/print_job_constants.h b/printing/print_job_constants.h
index 958b647a55..b39aed516 100644
--- a/printing/print_job_constants.h
+++ b/printing/print_job_constants.h
@@ -42,6 +42,7 @@
 PRINTING_EXPORT extern const char kSettingPageRange[];
 PRINTING_EXPORT extern const char kSettingPageRangeFrom[];
 PRINTING_EXPORT extern const char kSettingPageRangeTo[];
+PRINTING_EXPORT extern const char kSettingPreviewModifiable[];
 PRINTING_EXPORT extern const char kSettingPrinterName[];
 PRINTING_EXPORT extern const char kSettingPrintToPDF[];