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Revert of [Template Expressions] changing ${ leader to $i18n{ (patchset #4 id:60001 of https://codereview.chromium.org/1585923011/ )

Reason for revert:
broke incognito NTP and chrome://apps
https://code.google.com/p/chromium/issues/detail?id=581621

Original issue's description:
> [Template Expressions] changing ${ leader to $i18n{
>
> This CL changes the Template Expressions from using
> a ${ to identify the start of an expression, to using
> $i18n{.  The intention is to reduce (eliminate) false
> positives when searching for expressions that need
> replacement.  This CL also prepares for the replacement
> work to be done in a background thread and used on a
> broader set of files.
>
> BUG=506009
>
> Committed: https://crrev.com/5aa7fd5f14e49c65ebba87e4248424d622b92930
> Cr-Commit-Position: refs/heads/master@{#371537}

TBR=thakis@chromium.org,dschuyler@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=506009

Review URL: https://codereview.chromium.org/1647583003

Cr-Commit-Position: refs/heads/master@{#371888}