Getting rid of Isolate::current_zone() usage. Pass thread instead of isolate where it makes sense.

runtime/vm/debugger_api_impl_test.cc

 // Copyright (c) 2012, 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_mirrors_api.h"
 #include "include/dart_tools_api.h"
 #include "platform/assert.h"
 #include "vm/dart_api_impl.h"
 #include "vm/lockers.h"
 #include "vm/unit_test.h"
@@ skipping 2120 matching lines @@
       "}\n"
       "class Test4<A, B> extends Test2<A> {\n"
       "}\n"
       "class Test5<A, B, C> extends Test4<A, B> {\n"
       "}\n"
       "var s = new Set();\n"
       "var l = new List();\n"
       "int main() {\n"
       "}\n";
 
-  Isolate* isolate = Isolate::Current();
-  Zone* zone = isolate->current_zone();
+
+  Zone* zone = thread->zone();
   LoadScript(kScriptChars);
   ASSERT(script_lib != NULL);
   ASSERT(Dart_IsLibrary(script_lib));
   Dart_Handle core_lib = Dart_LookupLibrary(NewString("dart:core"));
 
   Dart_Handle Test_name = Dart_NewStringFromCString("Test");
   Dart_Handle Test1_name = Dart_NewStringFromCString("Test1");
   Dart_Handle Test2_name = Dart_NewStringFromCString("Test2");
   Dart_Handle Test3_name = Dart_NewStringFromCString("Test3");
   Dart_Handle Test4_name = Dart_NewStringFromCString("Test4");
@@ skipping 163 matching lines @@
       " null, 3, 7, 1, 8, 6, 9, 10, 10, 11, 11, 13,"
       " null, 4, 13, 3, 14, 10,"
       " null, 5, 17, 5, 18, 9, 19, 12,"
       " null, 6, 21, 1,"
       " null, 8, 24, 1, 25, 5, 26, 6, 27, 8,"
       " null, 9, 29, 1]",
       tokens_cstr);
 }
 
 }  // namespace dart