Fix layout of the sync and sign-in error dialogs when the page zoom is increased.

Fix layout of the sync and sign-in error dialogs when the page zoom is increased.

This CL does the following changes to the sync and sign-in error dialogs:
* Disables the web page zoom as these dialogs should look as native dialogs.
* Uses the document.body.offsetHeight instead of the scrollheight when computing
the preferred size for the dialog's webview as the scrollHeight is different
depending on the page zoom size (the values of the scrollHeight are equal to
offsetHeight / Chrome's page_zoom)
* Display the scrollbars as sometimes the dialog view may be smaller than the
preffered height of the scrollview.

BUG=685021
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2658783004
Cr-Commit-Position: refs/heads/master@{#446848}
(cherry picked from commit 55529d0408f80b154fd394f4f8e1749f5d17329a)

Review-Url: https://codereview.chromium.org/2672433002 .
Cr-Commit-Position: refs/branch-heads/2924@{#896}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}
Committed: https://chromium.googlesource.com/chromium/src/+/435efe2a501c668b9cc2515c2a04581a2a918cfb

[msarda, 2017-02-01 10:32:07]

Description was changed from

==========
Fix layout of the sync and sign-in error dialogs when the page zoom is
increased.

This CL does the following changes to the sync and sign-in error dialogs:
* Disables the web page zoom as these dialogs should look as native dialogs.
* Uses the document.body.offsetHeight instead of the scrollheight when computing
the preferred size for the dialog's webview as the scrollHeight is different
depending on the page zoom size (the values of the scrollHeight are equal to
offsetHeight / Chrome's page_zoom)
* Display the scrollbars as sometimes the dialog view may be smaller than the
preffered height of the scrollview.

BUG=685021
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2658783004
Cr-Commit-Position: refs/heads/master@{#446848}
(cherry picked from commit 55529d0408f80b154fd394f4f8e1749f5d17329a)
==========

to

==========
Fix layout of the sync and sign-in error dialogs when the page zoom is
increased.

This CL does the following changes to the sync and sign-in error dialogs:
* Disables the web page zoom as these dialogs should look as native dialogs.
* Uses the document.body.offsetHeight instead of the scrollheight when computing
the preferred size for the dialog's webview as the scrollHeight is different
depending on the page zoom size (the values of the scrollHeight are equal to
offsetHeight / Chrome's page_zoom)
* Display the scrollbars as sometimes the dialog view may be smaller than the
preffered height of the scrollview.

BUG=685021
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2658783004
Cr-Commit-Position: refs/heads/master@{#446848}
(cherry picked from commit 55529d0408f80b154fd394f4f8e1749f5d17329a)

Review-Url: https://codereview.chromium.org/2672433002 .
Cr-Commit-Position: refs/branch-heads/2924@{#896}
Cr-Branched-From:
3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}
Committed:
https://chromium.googlesource.com/chromium/src/+/435efe2a501c668b9cc2515c2a04...
==========

[msarda, 2017-02-01 10:32:08]

Committed patchset #2 (id:20001) manually as
435efe2a501c668b9cc2515c2a04581a2a918cfb.