Revert of Use the system provided harfbuzz on chromeos

Revert of Use the system provided harfbuzz on chromeos (https://codereview.chromium.org/203163003/)

Reason for revert:
chromeos doesn't have hb-icu.h

Original issue's description:
> Use the system provided harfbuzz on chromeos
> 
> It's part of the pango library we use already, so by using it, we avoid
> a link time collission.
> 
> However, if you build just the browser on linux on ubuntu 12, we don't
> have such an up to date pango available, so we need to be a bit smart
> about whether or not to use the system harfbuzz.
> 
> This also allows for treating linker warnings as errors on chromeos
> 
> BUG=353127
> R=jshin@chromium.org, thakis@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=259423
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=259530

TBR=jshin@chromium.org,thakis@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=353127
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=259534

[jochen (gone - plz use gerrit), 2014-03-26 09:30:30]

Created Revert of Use the system provided harfbuzz on chromeos

[commit-bot: I haz the power, 2014-03-26 09:30:42]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/jochen@chromium.org/212313003/1

[commit-bot: I haz the power, 2014-03-26 09:31:33]

Change committed as 259534