Use KernelTypeGraphBuilder in KernelInferrerEngine

pkg/compiler/lib/src/commandline_options.dart

Index: pkg/compiler/lib/src/commandline_options.dart
diff --git a/pkg/compiler/lib/src/commandline_options.dart b/pkg/compiler/lib/src/commandline_options.dart
index 25087ae3bb35e48afbc6ed211a417c65f350230c..c608d84ee70256906931785df9ab3fb9789db018 100644
--- a/pkg/compiler/lib/src/commandline_options.dart
+++ b/pkg/compiler/lib/src/commandline_options.dart
@@ -32,9 +32,6 @@ class Flags {
   static const String fatalWarnings = '--fatal-warnings';
   static const String generateCodeWithCompileTimeErrors =
       '--generate-code-with-compile-time-errors';
-  // Temporary flag to also integrate Kernel into global type inference.
-  // TODO(efortuna): Remove when fully implemented and simply use "useKernel".
-  static const String kernelGlobalInference = '--kernel-global-inference';
 
   /// Enable the unified front end, loading from .dill files, and compilation
   /// using the kernel representation.