Converts usage of EmbeddedContentViewActivity to CustomTabActivity.
This CL changes all call sites of EmbedContentViewActivity to use
CustomTabActivity.
Didn't delete the EmbedContentViewActivity code yet, also not sure if
we should clean the chrome strings for the titles if we don't need them.
There are a couple of details in the UI:
1. Title is now using html document title instead of chrome strings.
Not sure which one should we use here.
2. The color of the toolbar is same as EmbeddedContentViewActivity. But
the color of icons or other components depends on their own logic and
theme color of the activity, etc.
3. The url bar is not hidden for now, since the security icon color on
tablet is not correct.(Black icon on a dark background). Don't have
a spec so not sure if we would hide the url bar here and fix the icon
color logic.
Screen shots are attached in crbug.
BUG=
673522
Committed:
https://crrev.com/c81574599b63cc6d9af0285aa0876983be526e5c
Cr-Commit-Position: refs/heads/master@{#439168}