Revert of [chromedriver] Reenable PageLoadingTest.testShouldBeAbleToNavigateBackInTheBrowserHistory* (patchset #1 id:1 of https://codereview.chromium.org/786163003/)

Reason for revert:
This is causing bot failures. Not sure why it was working locally for Andrew but we'll need to investigate.

Original issue's description:
> [chromedriver] Reenable PageLoadingTest.testShouldBeAbleToNavigateBackInTheBrowserHistory*
>
> BUG=chromedriver:653
> NOTRY=true
>
> Committed: https://crrev.com/95563f4d9e1c8c5a78e91cb879651237f71f5eab
> Cr-Commit-Position: refs/heads/master@{#307416}

TBR=stgao@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=chromedriver:653

Review URL: https://codereview.chromium.org/786313003

Cr-Commit-Position: refs/heads/master@{#307507}
[chromedriver] Disable ImplicitWaitTest.testShouldImplicitlyWaitForASingleElement on Android

BUG=chromedriver:998
TBR=jbudorick@chromium.org

Review URL: https://codereview.chromium.org/785233006

Cr-Commit-Position: refs/heads/master@{#307638}
[chromedriver] Don't wait for responses from Tracing.end

BUG=chromedriver:997

Review URL: https://codereview.chromium.org/785403002

Cr-Commit-Position: refs/heads/master@{#307639}
[chromedriver] Release ChromeDriver 2.13

BUG=

Review URL: https://codereview.chromium.org/774383002

Cr-Commit-Position: refs/heads/master@{#307647}