Implement override-based type inference for instance methods.

pkg/front_end/testcases/inference/infer_method_function_typed.dart.outline.expect

Index: pkg/front_end/testcases/inference/infer_method_function_typed.dart.outline.expect
diff --git a/pkg/front_end/testcases/inference/infer_method_function_typed.dart.outline.expect b/pkg/front_end/testcases/inference/infer_method_function_typed.dart.outline.expect
new file mode 100644
index 0000000000000000000000000000000000000000..2de2dfdef40e7e311d985c0b0097adac72cf3369
--- /dev/null
+++ b/pkg/front_end/testcases/inference/infer_method_function_typed.dart.outline.expect
@@ -0,0 +1,21 @@
+library test;
+import self as self;
+import "dart:core" as core;
+
+typedef F = () → core::int;
+abstract class A extends core::Object {
+  constructor •() → void
+    ;
+  abstract method x(() → core::int value) → void;
+}
+abstract class B extends self::A {
+  constructor •() → void
+    ;
+  abstract method x(() → dynamic value) → void;
+}
+static method f<T extends core::Object>() → self::f::T
+  ;
+static method g(self::B b) → dynamic
+  ;
+static method main() → dynamic
+  ;