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Before this CL, the test would look for "Process Model Internals"
substring in page contents.  This substring is present, but is populated
dynamically in the "Frame Trees" pane:
- WebContents: Process Model Internals, 1 frame.

To make the test less dependent on when the dynamic text is added, this
CL starts looking instead for "Process Internals" substring which is
statically present in
//content/browser/resources/process/process_internals.html

Additionally, after this CL the test inspects page contents via gMock,
rather than via innerHTML.search API.  Hopefully, the change in this CL
will make test failures easier to diagnose in the future (i.e. gMock
should display mismatched |page_contents|).  Before this CL, the test
failure would just say that |innerHTML.search| API returned -1.

Bug: 1107995
Change-Id: I83e5f45563a780b5dc8919e36ad71b2e171ac2ff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2317852
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791956}