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After we migrated c/b/resources/gaia_auth_host/ to JS modules,
webview_saml_injected.js file in saml_handler.js wasn't inlined in
"injectedJs" variable anymore.

Since "// <include ..." doesn't work for generated files,
"addContentScripts" call is updated to load the script from file
instead.

saml_handler.js is also used in OOBE and in-session password change
flow. This CL updates their webui files to include
webview_saml_injected.js.

Bug: 1160632
Change-Id: I47a5bc0b2119dd0bab9bb492ccd743ce2cd48d05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2599861Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Yusuf Sengul <yusufsn@google.com>
Commit-Queue: Anastasiia N <anastasiian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839080}