[deps] Move ts_library out of third_party

ts_library.py and typescript.gni do not contain any third party code.
They had the Chromium license headers from the beginning. The only
"third-party"ness they have, is that they use the "typescript"
npm package.

[email protected]

Fixed: 362397305
Change-Id: I33a2ee2817c940e365f810e897de5907bf586093
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5816329
Reviewed-by: Alex Rudenko <[email protected]>
Commit-Queue: Simon Zünd <[email protected]>
diff --git a/BUILD.gn b/BUILD.gn
index 2b3c999..134c536 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -8,8 +8,8 @@
 import("./scripts/build/ninja/copy.gni")
 import("./scripts/build/ninja/node.gni")
 import("./scripts/build/ninja/vars.gni")
+import("./scripts/build/typescript/typescript.gni")
 import("./third_party/blink/public/public_features.gni")
-import("./third_party/typescript/typescript.gni")
 
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