Various IWYU fixes.

src/ast/ast-value-factory.h

 // Copyright 2014 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 12 matching lines @@
 // 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 V8_AST_AST_VALUE_FACTORY_H_
 #define V8_AST_AST_VALUE_FACTORY_H_
 
 #include "src/api.h"
 #include "src/base/hashmap.h"
+#include "src/conversions.h"
 #include "src/globals.h"
 #include "src/utils.h"
 
 // AstString, AstValue and AstValueFactory are for storing strings and values
 // independent of the V8 heap and internalizing them later. During parsing,
 // AstStrings and AstValues are created and stored outside the heap, in
 // AstValueFactory. After parsing, the strings and values are internalized
 // (moved into the V8 heap).
 namespace v8 {
 namespace internal {
@@ skipping 402 matching lines @@
   OTHER_CONSTANTS(F)
 #undef F
 };
 }  // namespace internal
 }  // namespace v8
 
 #undef STRING_CONSTANTS
 #undef OTHER_CONSTANTS
 
 #endif  // V8_AST_AST_VALUE_FACTORY_H_