remove remaining uses of default isolate in tests

test/cctest/cctest.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 75 matching lines @@
          const char* dependency, bool enabled, bool initialize);
   void Run();
   static CcTest* last() { return last_; }
   CcTest* prev() { return prev_; }
   const char* file() { return file_; }
   const char* name() { return name_; }
   const char* dependency() { return dependency_; }
   bool enabled() { return enabled_; }
 
   static v8::Isolate* isolate() {
+    CHECK(isolate_ != NULL);
     isolate_used_ = true;
     return isolate_;
   }
 
   static i::Isolate* i_isolate() {
     return reinterpret_cast<i::Isolate*>(isolate());
   }
 
   static i::Heap* heap() {
     return i_isolate()->heap();
   }
 
   // TODO(dcarney): Remove.
   // This must be called first in a test.
   static void InitializeVM() {
     CHECK(!isolate_used_);
     CHECK(!initialize_called_);
     initialize_called_ = true;
     v8::HandleScope handle_scope(CcTest::isolate());
     v8::Context::New(CcTest::isolate())->Enter();
   }
 
+  // Only for UNINITIALIZED_TESTs
+  static void DisableAutomaticDispose();
+
   // Helper function to configure a context.
   // Must be in a HandleScope.
   static v8::Local<v8::Context> NewContext(
       CcTestExtensionFlags extensions,
       v8::Isolate* isolate = CcTest::isolate());
 
  private:
   friend int main(int argc, char** argv);
   TestFunction* callback_;
   const char* file_;
@@ skipping 206 matching lines @@
 static inline void SimulateFullSpace(v8::internal::PagedSpace* space) {
   int old_linear_size = static_cast<int>(space->limit() - space->top());
   space->Free(space->top(), old_linear_size);
   space->SetTop(space->limit(), space->limit());
   space->ResetFreeList();
   space->ClearStats();
 }
 
 
 #endif  // ifndef CCTEST_H_