Migrate `front_end/screencast` to `devtools_entrypoint`

Bug: 1101738
Change-Id: I06405e2056875072e248acb601772ae416e6c4fa
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2323633
Commit-Queue: Jan Scheffler <janscheffler@chromium.org>
Auto-Submit: Jan Scheffler <janscheffler@chromium.org>
Reviewed-by: Paul Lewis <aerotwist@chromium.org>

diff --git a/all_devtools_modules.gni b/all_devtools_modules.gni
index 73f0d7a..d02cebe 100644
--- a/all_devtools_modules.gni
+++ b/all_devtools_modules.gni

@@ -194,9 +194,6 @@
   "resources/ServiceWorkerCacheViews.js",
   "resources/ServiceWorkersView.js",
   "resources/StorageItemsView.js",
-  "screencast/InputModel.js",
-  "screencast/ScreencastApp.js",
-  "screencast/ScreencastView.js",
   "security/SecurityModel.js",
   "security/SecurityPanel.js",
   "snippets/ScriptSnippetFileSystem.js",
@@ -468,6 +465,9 @@
   "protocol_client/InspectorBackend.js",
   "protocol_client/NodeURL.js",
   "root/Runtime.js",
+  "screencast/InputModel.js",
+  "screencast/ScreencastApp.js",
+  "screencast/ScreencastView.js",
   "sdk/CPUProfileDataModel.js",
   "sdk/CPUProfilerModel.js",
   "sdk/CSSFontFace.js",