Refactor SecurityStateModel/Clients for simplicity and reusability.

components/security_state/core/BUILD.gn

Index: components/security_state/core/BUILD.gn
diff --git a/components/security_state/BUILD.gn b/components/security_state/core/BUILD.gn
similarity index 92%
rename from components/security_state/BUILD.gn
rename to components/security_state/core/BUILD.gn
index 9eab4a3a0aaa8db810059f9efd5c72bc9816adaa..8bd2b8288427f415c09a88ff88fc5b844ed83294 100644
--- a/components/security_state/BUILD.gn
+++ b/components/security_state/core/BUILD.gn
@@ -7,7 +7,7 @@ if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
-static_library("security_state") {
+static_library("core") {
   sources = [
     "security_state_model.cc",
     "security_state_model.h",
@@ -37,7 +37,7 @@ source_set("unit_tests") {
   ]
 
   deps = [
-    ":security_state",
+    ":core",
     "//net:test_support",
     "//testing/gtest",
   ]