[Payments] Refactor into PaymentRequestState and Spec

components/payments/content/BUILD.gn

Index: components/payments/content/BUILD.gn
diff --git a/components/payments/content/BUILD.gn b/components/payments/content/BUILD.gn
index a6f75fe71c8c4396f81e3ce43865083323741744..e144d418b000ce62ce9ea19a3d0bb56880ae6fd2 100644
--- a/components/payments/content/BUILD.gn
+++ b/components/payments/content/BUILD.gn
@@ -32,6 +32,10 @@ static_library("payment_request_impl") {
     "payment_request.h",
     "payment_request_delegate.h",
     "payment_request_dialog.h",
+    "payment_request_spec.cc",
+    "payment_request_spec.h",
+    "payment_request_state.cc",
+    "payment_request_state.h",
     "payment_request_web_contents_manager.cc",
     "payment_request_web_contents_manager.h",
   ]
@@ -72,10 +76,14 @@ static_library("payment_validation") {
 source_set("unit_tests") {
   testonly = true
   sources = [
+    "payment_request_spec_unittest.cc",
+    "payment_request_state_unittest.cc",
     "payments_validators_test.cc",
   ]
 
   deps = [
+    ":payment_request",
+    ":payment_request_impl",
     ":payment_validation",
     "//base",
     "//base/test:test_support",