Fix Mac print crash

Stop executing the "OK branch" when the user cancels a print on Mac.

BUG=57125
TEST=manual, see bug description

Review URL: http://codereview.chromium.org/3509009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@60914 0039d316-1c4b-4281-b951-d872f2087c98

printing/printing_context_mac.mm

@@ -60,12 +60,12 @@
   // TODO(stuartmorgan): We really want a tab sheet here, not a modal window.
   // Will require restructuring the PrintingContext API to use a callback.
   NSInteger selection = [panel runModalWithPrintInfo:printInfo];
-  if (selection != NSOKButton) {
+  if (selection == NSOKButton) {
+    ParsePrintInfo([panel printInfo]);
+    callback->Run(OK);
+  } else {
     callback->Run(CANCEL);
   }
-
-  ParsePrintInfo([panel printInfo]);
-  callback->Run(OK);
 }
 
 PrintingContext::Result PrintingContext::UseDefaultSettings() {