Correctly set root_library based on the application script URI instead of looking for the library t…

runtime/bin/dfe.cc

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/dfe.h"
 #include "bin/dartutils.h"
 #include "bin/error_exit.h"
 #include "bin/file.h"
 
 #include "vm/kernel.h"
@@ skipping 59 matching lines @@
     // recompile the script.
     Dart_KernelCompilationResult kresult = Dart_CompileToKernel(url_string);
     if (kresult.status != Dart_KernelCompilationStatus_Ok) {
       return Dart_NewApiError(kresult.error);
     }
     kernel_ir = kresult.kernel;
     kernel_ir_size = kresult.kernel_size;
   }
   void* kernel_program = Dart_ReadKernelBinary(kernel_ir, kernel_ir_size);
   ASSERT(kernel_program != NULL);
-  Dart_Handle result = Dart_LoadKernel(kernel_program);
+  Dart_Handle url = Dart_NewStringFromCString(url_string);
+  Dart_Handle result = Dart_LoadScript(
+      url, Dart_Null(), reinterpret_cast<Dart_Handle>(kernel_program), 0, 0);
   if (Dart_IsError(result)) {
     return result;
   }
   // Finalize loading. This will complete any futures for completed deferred
   // loads.
   result = Dart_FinalizeLoading(true);
   if (Dart_IsError(result)) {
     return result;
   }
   return Dart_Null();
@@ skipping 68 matching lines @@
         *kernel_ir = buffer;
         return true;
       }
     }
   }
   return false;
 }
 
 }  // namespace bin
 }  // namespace dart