build: remove stale dependency for webrtc desktop capture module (#32318)

WebRTC has changed how they integrate into Chromium, they don't
expose their dependencies externally anymore. Instead, one must
now go through webrtc_overrides:
https://chromium.googlesource.com/chromium/src.git/+/cbc90fd093956

We're already including webrtc_overrides as a dependency which
includes the modules, so this extra deps isn't needed anymore.

Co-authored-by: Romain Pokrzywka <[email protected]>

BUILD.gn

@@ -632,12 +632,6 @@ source_set("electron_lib") {
   }
 
   if (enable_desktop_capturer) {
-    if (is_component_build && !is_linux) {
-      # On windows the implementation relies on unexported
-      # DxgiDuplicatorController class.  On macOS the implementation
-      # relies on unexported webrtc::GetWindowOwnerPid method.
-      deps += [ "//third_party/webrtc/modules/desktop_capture" ]
-    }
     sources += [
       "shell/browser/api/electron_api_desktop_capturer.cc",
       "shell/browser/api/electron_api_desktop_capturer.h",