Convert Site Isolation Win bot to --isolate-extensions [2nd attempt].

content/test/BUILD.gn

Index: content/test/BUILD.gn
diff --git a/content/test/BUILD.gn b/content/test/BUILD.gn
index a858fd985893b26a7e3107c72168de0a9a5285e7..efddf25ad94cafefbe98f42970d3d18e3e668800 100644
--- a/content/test/BUILD.gn
+++ b/content/test/BUILD.gn
@@ -726,6 +726,7 @@ test("content_browsertests") {
 
   data_deps = [
     "//content/shell:pak",
+    "//testing/buildbot/filters:content_browsertests",
     "//third_party/mesa:osmesa",
   ]
 
@@ -762,7 +763,6 @@ test("content_browsertests") {
   }
 
   if (is_win || is_linux || is_android) {
-    data += [ "//testing/buildbot/filters/site-per-process.content_browsertests.filter" ]
   }
 
   if (is_win) {
@@ -785,7 +785,6 @@ test("content_browsertests") {
 
   if (is_linux) {
     sources += [ "../zygote/zygote_browsertest.cc" ]
-    data += [ "//testing/buildbot/filters/browser-side-navigation.linux.content_browsertests.filter" ]
   }
 
   if (is_android) {