Use "second" instead of "sec" in TimeRemainingLong()

This makes more sense, also it is consistent with
TimeDurationLong().

At that occasion, fix bad grammar in ui_strings.grd.

Unit testing is provisional and will be adjusted once
https://codereview.chromium.org/139413005/ has landed.

BUG=340113
TEST=full unit test coverage

Review URL: https://codereview.chromium.org/150573011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249335 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249335
[Android WebView] Stabilize AwZoomTest.testMagnification...

The page that is used for testing is updated to have wide content, so
Blink actually sets up the page scale to the specified 'initial-scale'.

After loading the page, the test now waits until the page scale becomes
equal to the one specified in 'initial-scale' / 'minimum-scale', which ensures
that the viewport meta tag has been fully processed. This should prevent
the situation when the test discovers that the page can still be zoomed out.

I have encountered an issue with DCHECKs in
InProcessViewRenderer::SetTotalRootLayerScrollOffset, and had to disable
them.

BUG=340327,340648
R=mkosiba@chromium.org

Review URL: https://codereview.chromium.org/143683005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249336 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249336