Updated sha1 - mismatch

The sha1 in the formula was: dfcedfe05a87739430bb8d71cf66b05e2bde84f6 
The actual sha1 is: 17a294ad64f9969189d0d3faa06d963bf72be5b3
Merge pull request #580 from alisamii/patch-1

Updated chromium sha1 - mismatch