Remove several grab-bag includes from the v8.h header.

src/i18n.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 // limitations under the License.
 
 #include "src/i18n.h"
 
+#include "src/api.h"
+#include "src/factory.h"
+#include "src/isolate.h"
 #include "unicode/brkiter.h"
 #include "unicode/calendar.h"
 #include "unicode/coll.h"
 #include "unicode/curramt.h"
 #include "unicode/dcfmtsym.h"
 #include "unicode/decimfmt.h"
 #include "unicode/dtfmtsym.h"
 #include "unicode/dtptngen.h"
 #include "unicode/locid.h"
 #include "unicode/numfmt.h"
@@ skipping 941 matching lines @@
 
 void BreakIterator::DeleteBreakIterator(
     const v8::WeakCallbackData<v8::Value, void>& data) {
   DeleteNativeObjectAt<icu::BreakIterator>(data, 0);
   DeleteNativeObjectAt<icu::UnicodeString>(data, 1);
   DestroyGlobalHandle(data);
 }
 
 }  // namespace internal
 }  // namespace v8