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This CL adds the following tests to app_shell_browsertests:
WebViewAPITest.testAssignSrcAfterCrash
WebViewAPITest.testCannotMutateEventName
WebViewAPITest.testContentLoadEvent
WebViewAPITest.tDestroyOnEventListener
WebViewAPITest.testDisplayNoneWebviewLoad
WebViewAPITest.testDisplayNoneWebviewRemoveChild
WebViewAPITest.testExecuteScript
WebViewAPITest.testExecuteScriptFail

BUG=352293

Review URL: https://codereview.chromium.org/607913005

Cr-Commit-Position: refs/heads/master@{#297256}