Revert of Reland of Move side-loaded test data /sdcard -> /sdcard/gtestdata (patchset #3 id:300001 of https://codereview.chromium.org/2018663002/ )

Reason for revert:
Breaking quota-related tests in content_browsertests
https://crbug.com/617213

Original issue's description:
> Reland of Move side-loaded test data /sdcard -> /sdcard/chromium_tests_root
>
> Reason for reland:
> Updated webview tests that broke (WebViewLayoutTest.java)
>
> And use delete_device_stale=True when pushing. This will prevent tests
> mistakenly passing when they depend on stale data files from a previous test.
>
> TBR=jbudorick@chromium.org,thakis@chromium.org,mef@chromium.org
> BUG=607169
>
> Committed: https://crrev.com/2524a0db714a44fbce723e00f6ed914e6d143cb6
> Cr-Commit-Position: refs/heads/master@{#396479}

TBR=jbudorick@chromium.org,thakis@chromium.org,mef@chromium.org,torne@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=607169,617213,616155

Review-Url: https://codereview.chromium.org/2044523003
Cr-Commit-Position: refs/heads/master@{#398137}
26 files changed