Remove from chromium build targets that are not compatible with it.

We need to be able build chromium with rtc_include_tests = true. It
reveals a lot of targets that are not compatible with chromium but
aren't marked so.

`rtc_include_tests=true` has been considered a way to disable targets for the Chromium build, causing an overload on rtc_include_tests while the meaning of the two GN args (rtc_include_tests and build_with_chromium) should be kept separated.

Bug: webrtc:12404
Change-Id: I2f72825445916eae7c20ef9338672d6a07a9b9ff
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/203890
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Andrey Logvin <landrey@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33124}
diff --git a/BUILD.gn b/BUILD.gn
index bf524bf..8d9a76b 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -527,7 +527,7 @@
   }
 }
 
-if (rtc_include_tests) {
+if (rtc_include_tests && !build_with_chromium) {
   rtc_test("rtc_unittests") {
     testonly = true