Bug 891806 - part 1 - replace 'yield;' with 'yield undefined;' in browser/; r=jaws
Bug 891806 - part 2 - replace 'yield;' with 'yield undefined;' in content/; r=smaug
Bug 891806 - part 3 - replace 'yield;' with 'yield undefined;' in docshell/; r=smaug
Bug 891806 - part 4 - replace 'yield;' with 'yield undefined;' in dom/; r=smaug