Fix the problem that currently chrome count user action

which not explicit decline translation as decline and
only count those explicit action. The following actions
will not be counted as a decline action after this fix.
a. User open a new tab/window before confirm the translation
b. User switch to a new tab/window to load page before confirm the
translation
BUG=575023

Review URL: https://codereview.chromium.org/1632953002

Cr-Commit-Position: refs/heads/master@{#376016}