test: remove no longer existing Chromium test deps

cc_blink_unittests has been removed in
https://chromium-review.googlesource.com/1053765

mojo_common_unittests has been removed in
https://chromium-review.googlesource.com/1028000

BUILD.gn

@@ -744,7 +744,6 @@ group("chromium_unittests") {
   deps = [
     "//base:base_unittests",
     "//cc:cc_unittests",
-    "//cc/blink:cc_blink_unittests",
     "//content/test:content_unittests",
     "//crypto:crypto_unittests",
     "//device:device_unittests",
@@ -756,7 +755,6 @@ group("chromium_unittests") {
     "//media/midi:midi_unittests",
     "//media/mojo:media_mojo_unittests",
     "//mojo:mojo_unittests",
-    "//mojo/common:mojo_common_unittests",
     "//net:net_unittests",
     "//ppapi:ppapi_unittests",
     "//printing:printing_unittests",