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Remove android_webview_apk and android_webview_test_apk

This CL removes both android_webview_apk and android_webview_test_apk
build targets as we are deprecating those two names.

Please refer the crbug for more info, and the new target names are
webview_instrumentation_apk and webview_instrumentation_test_apk
correspondingly.

New build names are WebViewInstrumentation.apk and
WebViewInstrumentationTest.apk

BUG=701938

Review-Url: https://codereview.chromium.org/2879723002
Cr-Commit-Position: refs/heads/master@{#472276}