Update Chrome Cloud Reporting test

1) Use raw string to avoid multiple escapes.
2) Add tests for plugins and signed in user data.
3) Add slash and quote in the test data to make sure they can be escaped
   properly by the report helper.

Bug: 924645
Change-Id: I00d6166d967d8ebae82ac8bba5cc698b3eb2e418
Reviewed-on: https://chromium-review.googlesource.com/c/1431335
Reviewed-by: Marc-André Decoste <mad@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625359}
1 file changed