Remove dart:platform library.

runtime/bin/dartutils.cc

Index: runtime/bin/dartutils.cc
diff --git a/runtime/bin/dartutils.cc b/runtime/bin/dartutils.cc
index a3a2f693f65396279e80d6845cd6bd17b45db285..657a4579b609634f10d06a5f4b84111567a276d6 100644
--- a/runtime/bin/dartutils.cc
+++ b/runtime/bin/dartutils.cc
@@ -29,7 +29,6 @@ const char* DartUtils::kCoreLibURL = "dart:core";
 const char* DartUtils::kIOLibURL = "dart:io";
 const char* DartUtils::kIOLibPatchURL = "dart:io-patch";
 const char* DartUtils::kUriLibURL = "dart:uri";
-const char* DartUtils::kPlatformLibURL = "dart:platform";
 const char* DartUtils::kHttpScheme = "http:";
 
 const char* DartUtils::kIdFieldName = "_id";
@@ -712,29 +711,17 @@ Dart_Handle DartUtils::PrepareForScriptLoading(const char* package_root,
 
   // Set up package root if specified.
   if (package_root != NULL) {
-    Dart_Handle package_root_string = NewString(package_root);
-    if (Dart_IsError(package_root_string)) {
-      return package_root_string;
-    }
-    const int kNumArgs = 1;
-    Dart_Handle dart_args[kNumArgs];
-    dart_args[0] = package_root_string;
-    result = Dart_Invoke(builtin_lib,
+    result = NewString(package_root);
+    if (!Dart_IsError(result)) {
+      const int kNumArgs = 1;
+      Dart_Handle dart_args[kNumArgs];
+      dart_args[0] = result;
+      return Dart_Invoke(builtin_lib,
                          NewString("_setPackageRoot"),
                          kNumArgs,
                          dart_args);
-    if (Dart_IsError(result)) {
-      return result;
     }
   }
-
-  // Setup the platform library's _platform object.
-  internal_lib = Dart_LookupLibrary(NewString(kPlatformLibURL));
-  DART_CHECK_VALID(internal_lib);
-  Dart_Handle platform =
-      Dart_Invoke(builtin_lib, NewString("_getPlatform"), 0, NULL);
-  result = Dart_SetField(internal_lib, NewString("_platform"), platform);
-  DART_CHECK_VALID(result);
   return result;
 }