Remove unused V8 integration code in Sky

sky/engine/bindings/core/v8/V8RecursionScope.h

-/*
- * Copyright (C) 2011 Google Inc. 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 with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef SKY_ENGINE_BINDINGS_CORE_V8_V8RECURSIONSCOPE_H_
-#define SKY_ENGINE_BINDINGS_CORE_V8_V8RECURSIONSCOPE_H_
-
-#include "sky/engine/bindings/core/v8/V8PerIsolateData.h"
-#include "sky/engine/core/dom/ExecutionContext.h"
-#include "sky/engine/platform/ScriptForbiddenScope.h"
-#include "sky/engine/wtf/Noncopyable.h"
-#include "v8/include/v8.h"
-
-namespace blink {
-
-// C++ calls into script contexts which are "owned" by WebKit (created in a
-// process where WebKit.cpp initializes v8) must declare their type:
-//
-//   1. Calls into page/author script from a frame
-//   2. Calls into page/author script from a worker
-//   3. Calls into internal script (typically setup/teardown work)
-//
-// Debug-time checking of this is enforced via this class.
-//
-// Calls of type (1) should generally go through ScriptController, as inspector
-// instrumentation is needed. ScriptController allocates V8RecursionScope for you.
-// Calls of type (2) should always stack-allocate a V8RecursionScope in the same
-// block as the call into script. Calls of type (3) should stack allocate a
-// V8RecursionScope::MicrotaskSuppression -- this skips work that is spec'd to
-// happen at the end of the outer-most script stack frame of calls into page script:
-//
-// http://www.whatwg.org/specs/web-apps/current-work/#perform-a-microtask-checkpoint
-class V8RecursionScope {
-    WTF_MAKE_NONCOPYABLE(V8RecursionScope);
-public:
-    V8RecursionScope(v8::Isolate* isolate, ExecutionContext* context)
-        : m_isolate(isolate)
-    {
-        V8PerIsolateData::from(m_isolate)->incrementRecursionLevel();
-        RELEASE_ASSERT(!ScriptForbiddenScope::isScriptForbidden());
-        // If you want V8 to autorun microtasks, this class needs to have a
-        // v8::Isolate::SuppressMicrotaskExecutionScope member.
-        ASSERT(!isolate->WillAutorunMicrotasks());
-    }
-
-    ~V8RecursionScope()
-    {
-        if (!V8PerIsolateData::from(m_isolate)->decrementRecursionLevel())
-            didLeaveScriptContext();
-    }
-
-    static int recursionLevel(v8::Isolate* isolate)
-    {
-        return V8PerIsolateData::from(isolate)->recursionLevel();
-    }
-
-#if ENABLE(ASSERT)
-    static bool properlyUsed(v8::Isolate* isolate)
-    {
-        return recursionLevel(isolate) > 0 || V8PerIsolateData::from(isolate)->internalScriptRecursionLevel() > 0;
-    }
-#endif
-
-    class MicrotaskSuppression {
-    public:
-        MicrotaskSuppression(v8::Isolate* isolate)
-#if ENABLE(ASSERT)
-            : m_isolate(isolate)
-#endif
-        {
-            ASSERT(!ScriptForbiddenScope::isScriptForbidden());
-#if ENABLE(ASSERT)
-            V8PerIsolateData::from(m_isolate)->incrementInternalScriptRecursionLevel();
-#endif
-        }
-
-        ~MicrotaskSuppression()
-        {
-#if ENABLE(ASSERT)
-            V8PerIsolateData::from(m_isolate)->decrementInternalScriptRecursionLevel();
-#endif
-        }
-
-    private:
-#if ENABLE(ASSERT)
-        v8::Isolate* m_isolate;
-#endif
-    };
-
-private:
-    void didLeaveScriptContext();
-
-    v8::Isolate* m_isolate;
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_BINDINGS_CORE_V8_V8RECURSIONSCOPE_H_