Revert of RenderTextHarfBuzz: Decide run direction by BiDi embedding level

Revert of RenderTextHarfBuzz: Decide run direction by BiDi embedding level (https://codereview.chromium.org/326123003/)

Reason for revert:
Memory leak: http://build.chromium.org/p/chromium.memory/builders/Linux%20ASan%20LSan%20Tests%20%282%29/builds/3570/steps/ui_unittests/logs/HarfBuzz_RunDirection

Original issue's description:
> RenderTextHarfBuzz: Decide run direction by BiDi embedding level
> 
> BUG=382178
> NOTRY=true
> R=msw
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=276379

TBR=msw@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=382178
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=276387

[ckocagil, 2014-06-11 14:21:25]

Created Revert of RenderTextHarfBuzz: Decide run direction by BiDi embedding
level

[commit-bot: I haz the power, 2014-06-11 14:23:24]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ckocagil@chromium.org/324413002/1

[commit-bot: I haz the power, 2014-06-11 14:25:20]

Change committed as 276387

[msw, 2014-06-11 16:44:43]

Hmm, do those leaks occur anyway, and the test just exposed them? lgtm