Various vmservice/observatory fixes:

runtime/vm/service.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 "vm/service.h"
 
 #include "include/dart_api.h"
 #include "platform/globals.h"
 
 #include "vm/compiler.h"
@@ skipping 1281 matching lines @@
 }
 
 
 static bool HandleScriptsEnumerate(Isolate* isolate, JSONStream* js) {
   JSONObject jsobj(js);
   jsobj.AddProperty("type", "ScriptList");
   jsobj.AddProperty("id", "scripts");
   JSONArray members(&jsobj, "members");
   const GrowableObjectArray& libs =
       GrowableObjectArray::Handle(isolate->object_store()->libraries());
-  int num_libs = libs.Length();
+  intptr_t num_libs = libs.Length();
   Library &lib = Library::Handle();
   Script& script = Script::Handle();
   for (intptr_t i = 0; i < num_libs; i++) {
     lib ^= libs.At(i);
     ASSERT(!lib.IsNull());
     ASSERT(Smi::IsValid(lib.index()));
     const Array& loaded_scripts = Array::Handle(lib.LoadedScripts());
     ASSERT(!loaded_scripts.IsNull());
     intptr_t num_scripts = loaded_scripts.Length();
     for (intptr_t i = 0; i < num_scripts; i++) {
@@ skipping 649 matching lines @@
   while (current != NULL) {
     if (strcmp(name, current->name()) == 0) {
       return current;
     }
     current = current->next();
   }
   return NULL;
 }
 
 }  // namespace dart