[iwyu] Include handles.h less.

src/conversions.cc

 // Copyright 2011 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.
 
 #include "src/conversions.h"
 
 #include <limits.h>
 #include <stdarg.h>
 #include <cmath>
 
 #include "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/char-predicates-inl.h"
 #include "src/codegen.h"
 #include "src/conversions-inl.h"
 #include "src/dtoa.h"
 #include "src/factory.h"
+#include "src/handles.h"
 #include "src/list-inl.h"
 #include "src/strtod.h"
 #include "src/utils.h"
 
 #ifndef _STLP_VENDOR_CSTD
 // STLPort doesn't import fpclassify into the std namespace.
 using std::fpclassify;
 #endif
 
 namespace v8 {
@@ skipping 543 matching lines @@
   char reverse_buffer[kBufferSize + 1];  // Result will be /0 terminated.
   Vector<char> reverse_vector(reverse_buffer, arraysize(reverse_buffer));
   const char* reverse_string = DoubleToCString(d, reverse_vector);
   for (int i = 0; i < length; ++i) {
     if (static_cast<uint16_t>(reverse_string[i]) != buffer[i]) return false;
   }
   return true;
 }
 }  // namespace internal
 }  // namespace v8