Revert "[inspector] added inspector test runner [part 3]"

This reverts commit f3f9f444.

Revert "[inspector] added inspector test runner [part 4]"

This reverts commit 4a5f5d09.

Revert "[inspector] added inspector test runner [part 5]"

This reverts commit 9ddbdab1.

Reverting this in order to revert parts 1-2 which block the roll:
https://codereview.chromium.org/2379053003/

BUG=chromium:635948
TBR=kozyatinskiy@chromium.org,
NOTRY=true

Review-Url: https://codereview.chromium.org/2379303002
Cr-Commit-Position: refs/heads/master@{#39908}