Bug 996455: use device pixels, not css pixels when determining if an EXIF preview is big enough
Merge pull request #19956 from davidflanagan/bug996455

Bug 996455: use device pixels, not css pixels when determining if an EXIF preview is big enough r=pdahiya a=1.3+,hkoka
Merge branch 'v1.3' into v1.3t

Conflicts:
	apps/gallery/js/MetadataParser.js