Another round of cleanups for http://www.dartbug.com/15922

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
@@ skipping 4157 matching lines @@
     RETURN_NULL_ERROR(buffer);
   }
   NoHeapGrowthControlScope no_growth_control;
 
   const Snapshot* snapshot = Snapshot::SetupFromBuffer(buffer);
   if (!snapshot->IsScriptSnapshot()) {
     return Api::NewError("%s expects parameter 'buffer' to be a script type"
                          " snapshot.", CURRENT_FUNC);
   }
   if (snapshot->length() != buffer_len) {
-    return Api::NewError("%s: 'buffer_len' of %" Pd " is not equal to %d which"
-                         " is the expected length in the snapshot.",
+    return Api::NewError("%s: 'buffer_len' of %" Pd " is not equal to %" Pd64
+                         " which is the expected length in the snapshot.",
                          CURRENT_FUNC, buffer_len, snapshot->length());
   }
   Library& library =
       Library::Handle(isolate, isolate->object_store()->root_library());
   if (!library.IsNull()) {
     const String& library_url = String::Handle(isolate, library.url());
     return Api::NewError("%s: A script has already been loaded from '%s'.",
                          CURRENT_FUNC, library_url.ToCString());
   }
   CHECK_CALLBACK_STATE(isolate);
@@ skipping 359 matching lines @@
 }
 
 
 // --- Service support ---
 
 DART_EXPORT Dart_Isolate Dart_GetServiceIsolate(void* callback_data) {
   return Api::CastIsolate(Service::GetServiceIsolate(callback_data));
 }
 
 }  // namespace dart