Revert "FileAPI: Add WebFileSystem::resolveURL" browser_tests are failing.

This reverts commit 619bc85ed46bd2a20e6d5834dd7d58edf20aa830.

Blink rolls get stuck after this path due to problems with FileManagerBrowserTests on Chrome OS.
See http://build.chromium.org/p/tryserver.chromium/builders/linux_chromeos/builds/156866/steps/browser_tests/logs/Test_1

BUG=none
TBR=nhiroki@chromium.org, japhet@chromium.org

Review URL: https://codereview.chromium.org/23514076

git-svn-id: svn://svn.chromium.org/blink/trunk@158188 bbb929c8-8fbe-4397-9dbb-9b2b20218538