[CCA] Copy missing dependency browser_proxy_interface.js

Bug: 1037982
Test: Remove chrome and rebuild and redeploy chrome, verify CCA function
normally.

Change-Id: I1d8f6fc121734516a0bdc77d6e5d9f2a602d3b57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982506
Commit-Queue: Kuo Jen Wei <inker@chromium.org>
Commit-Queue: Shik Chen <shik@chromium.org>
Auto-Submit: Kuo Jen Wei <inker@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727535}

chrome/browser/resources/chromeos/camera/BUILD.gn

@@ -134,6 +134,8 @@ copy("chrome_camera_app_js") {
 
 copy("chrome_camera_app_js_browser_proxy") {
   sources = [
+    # TODO(b/129956426): Remove dependency used only in closure compiler check.
+    "src/js/browser_proxy/browser_proxy_interface.js",
     "src/js/browser_proxy/browser_proxy.js",
   ]