3893 [url_launcher] Migrate pushRouteNameToFramework to ChannelBuffers (cla: yes, waiting for tree to go green, p: url_launcher)

3902 [url_launcher] Migrate maven repo from jcenter to mavenCentral (cla: yes, waiting for tree to go green, p: url_launcher, platform-android)

3903 Enable web integration tests on stable (cla: yes, waiting for tree to go green, p: file_selector, p: google_sign_in, p: url_launcher, p: connectivity, platform-web)