Remove grab-bag includes of v8.h from everywhere.

src/version.h

 // Copyright 2009 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.
 
 #ifndef V8_VERSION_H_
 #define V8_VERSION_H_
 
 #include "src/base/functional.h"
+#include "src/vector.h"
 
 namespace v8 {
 namespace internal {
 
 class Version {
  public:
   // Return the various version components.
   static int GetMajor() { return major_; }
   static int GetMinor() { return minor_; }
   static int GetBuild() { return build_; }
@@ skipping 23 matching lines @@
   static const char* version_string_;
 
   // In test-version.cc.
   friend void SetVersion(int major, int minor, int build, int patch,
                          bool candidate, const char* soname);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_VERSION_H_