Split browser-specific and generic code in components/task_scheduler_util/.

components/task_scheduler_util/initialization/BUILD.gn

Index: components/task_scheduler_util/initialization/BUILD.gn
diff --git a/components/task_scheduler_util/initialization/BUILD.gn b/components/task_scheduler_util/initialization/BUILD.gn
index 213326bd9971e542f3c4bc0ada1d05f3f8d4d3a3..26c6ba2401dccbea57ad86aa05f8503aedb45820 100644
--- a/components/task_scheduler_util/initialization/BUILD.gn
+++ b/components/task_scheduler_util/initialization/BUILD.gn
@@ -9,18 +9,6 @@ static_library("initialization") {
   ]
 
   deps = [
-    "//base",
-  ]
-}
-
-source_set("unit_tests") {
-  testonly = true
-  sources = [
-    "browser_util_unittest.cc",
-  ]
-  deps = [
-    ":initialization",
-    "//base",
-    "//testing/gtest",
+    "//components/task_scheduler_util/browser",
   ]
 }