Don't include <iostream>.

third_party/WebKit/Source/core/css/CSSValueTestHelper.h

 /*
  * Copyright (c) 2013, 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
@@ skipping 21 matching lines @@
  * Make testing with gtest and gmock nicer by adding pretty print and other
  * helper functions.
  */
 
 #ifndef CSSValueTestHelper_h
 #define CSSValueTestHelper_h
 
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSValue.h"
 
-#include <iostream>
+#include <ostream>
 
 namespace testing {
 namespace internal {
 
 // gtest tests won't compile with clang when trying to EXPECT_EQ a class that
 // has the "template<typename T> operator T*()" private.
 // (See https://code.google.com/p/googletest/issues/detail?id=442)
 //
 // Work around is to define this custom IsNullLiteralHelper.
 char(&IsNullLiteralHelper(const blink::CSSValue&))[2];
@@ skipping 14 matching lines @@
 }
 
 inline void PrintTo(const CSSPrimitiveValue& cssValue, ::std::ostream* os, const char* typeName = "CSSPrimitiveValue")
 {
     PrintTo(static_cast<const CSSValue&>(cssValue), os, typeName);
 }
 
 } // namespace blink
 
 #endif