Remove web page replay based pyauto tests.

tools/page_cycler/webpagereplay/README

Index: tools/page_cycler/webpagereplay/README
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-Page Cycler Tests with Web Page Replay
----------------------------------------------------------------------------
-Web Page Replay is a proxy that can record and "play" web pages with
-simulated network characteristics -- without having to edit the pages
-by hand. With WPR, tests can use "real" web content, and catch
-performance issues that may result from introducing network delays and
-bandwidth throttling.
-
-The Chromium extension here is used to load URLs, record the times,
-and set the appropriate cookies for src/tools/page_cycler/common/report.html.
-
-For more information:
-https://sites.google.com/a/chromium.org/dev/developers/testing/page-cyclers-wpr
-https://sites.google.com/a/chromium.org/dev/developers/testing/page-cyclers
-http://code.google.com/p/web-page-replay