Remove value packing and custom style building for text-underline-position.

Remove value packing and custom style building for text-underline-position.

The user of this property (currently only computeUnderlineOffset) is
oblivious to the fact that RenderStyle::textUnderlinePosition may be a
packed value. (It looks like we'll ASSERT_NOT_REACHED if we actually pack
values during style building).

This was probably done in anticipation of the currently missing left|right
values defined by CSS3 Text Decoration.

I suggest that we remove the custom behavior until support for the
properties are added. When/if support for left|right is added, it should
probably go through StyleBuilderConverter anyway.

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179384

[andersr, 2014-07-31 12:51:12]

Note: this is done on top of another patch:
https://codereview.chromium.org/424683004/

[Timothy Loh, 2014-08-01 00:21:46]

On 2014/07/31 12:51:12, andersr wrote:
> Note: this is done on top of another patch:
> https://codereview.chromium.org/424683004/

lgtm

[andersr, 2014-08-01 08:53:48]

The CQ bit was checked by andersr@opera.com

[commit-bot: I haz the power, 2014-08-01 08:54:51]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/andersr@opera.com/436563002/1

[commit-bot: I haz the power, 2014-08-01 10:00:46]

Change committed as 179384