Add a warning for the deprecation of content-initiated data URL navigations
This CL adds a console warning when a page navigates the top level frame to a
data URL.
The browser tests are added to WebContentsImpl tests to be consistent with
the view-source URL tests.
This CL also updates most of the layout tests to avoid loading data URLs at
the top level. The only exceptions are xss-DENIED-* tests which will be updated
when the actual blocking happens.
BUG=594215
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation
Review-Url: https://codereview.chromium.org/2694903007
Cr-Commit-Position: refs/heads/master@{#455226}
86 files changed
