Get rid of DomTracker

NodeId's can be invalidated between remote calls.
Use of NodeId's can lead to errors with unresolved nodes.

Bug: chromedriver:4048
Change-Id: I6d60587a2f6da97bf5b71c440bca2396625296f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3634385
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Vladimir Nechaev <nechaev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1001507}

chrome/test/chromedriver/BUILD.gn

@@ -117,8 +117,6 @@ source_set("automation_client_lib") {
     "chrome/devtools_event_listener.h",
     "chrome/devtools_http_client.cc",
     "chrome/devtools_http_client.h",
-    "chrome/dom_tracker.cc",
-    "chrome/dom_tracker.h",
     "chrome/download_directory_override_manager.cc",
     "chrome/download_directory_override_manager.h",
     "chrome/frame_tracker.cc",
@@ -419,7 +417,6 @@ test("chromedriver_unittests") {
     "chrome/devtools_client_impl_unittest.cc",
     "chrome/devtools_endpoint_unittest.cc",
     "chrome/devtools_http_client_unittest.cc",
-    "chrome/dom_tracker_unittest.cc",
     "chrome/download_directory_override_manager_unittest.cc",
     "chrome/frame_tracker_unittest.cc",
     "chrome/geolocation_override_manager_unittest.cc",