Revert of Set defaultPageScaleLimits before setIgnoreViewportTagScaleLimits

Revert of Set defaultPageScaleLimits before setIgnoreViewportTagScaleLimits (patchset #2 id:20001 of https://codereview.chromium.org/860283005/)

Reason for revert:
Speculatively reverting to try to fix broken layout tests in Blink:
compositing/iframes/iframe-composited-scrolling-hide-and-show.html
compositing/iframes/overlapped-iframe-iframe.html
svg/as-border-image/svg-as-border-image-2.html
and more.

Original issue's description:
> Set defaultPageScaleLimits before setIgnoreViewportTagScaleLimits
>
> setIgnoreViewportTagScaleLimits copies the default limits into the UA
> constraints. This was happening before the defualt limits were set during
> initialization so it was clamping page scale at [1,1].
>
> BUG=453377
>
> Committed: https://crrev.com/ebbcc53e21fbfe15a76fa7fbf6d14c84095880ee
> Cr-Commit-Position: refs/heads/master@{#314668}

TBR=aelias@chromium.org,sievers@chromium.org,bokan@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=453377
Committed: https://crrev.com/910b93d89932cc75fcce36f4dbc5f3bef7c2f064
Cr-Commit-Position: refs/heads/master@{#314723}

[dcheng, 2015-02-05 02:33:50]

Created Revert of Set defaultPageScaleLimits before
setIgnoreViewportTagScaleLimits

[commit-bot: I haz the power, 2015-02-05 02:34:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/897173003/1

[commit-bot: I haz the power, 2015-02-05 02:35:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-05 02:37:07]

Patchset 1 (id:??) landed as
https://crrev.com/910b93d89932cc75fcce36f4dbc5f3bef7c2f064
Cr-Commit-Position: refs/heads/master@{#314723}

[dcheng, 2015-02-05 03:14:20]

The Mac 10.8 retina tests appear to still be broken, so I'll probably be
reverting this revert.

[aelias_OOO_until_Jul13, 2015-02-05 03:39:27]

On 2015/02/05 at 03:14:20, dcheng wrote:
> The Mac 10.8 retina tests appear to still be broken, so I'll probably be
reverting this revert.

Yeah I think it's very unlikely to be related.

[dcheng, 2015-02-05 04:02:43]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/900153002/ by dcheng@chromium.org.

The reason for reverting is: These aren't the changes you're looking for..