Remove unnecessary explicit keywords from a constructor with more than one parameters in css direct…

Source/core/css/CSSContentDistributionValue.h

 // Copyright (c) 2014 The Chromium 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 CSSContentDistributionValue_h
 #define CSSContentDistributionValue_h
 
 #include "core/css/CSSValue.h"
 #include "core/css/CSSValuePool.h"
 #include "wtf/RefPtr.h"
@@ skipping 14 matching lines @@
 
     PassRefPtrWillBeRawPtr<CSSPrimitiveValue> overflow() const { return cssValuePool().createIdentifierValue(m_overflow); }
 
     String customCSSText() const;
 
     bool equals(const CSSContentDistributionValue&) const;
 
     void traceAfterDispatch(Visitor* visitor) { CSSValue::traceAfterDispatch(visitor); }
 
 private:
-    explicit CSSContentDistributionValue(CSSValueID distribution, CSSValueID position, CSSValueID overflow);
+    CSSContentDistributionValue(CSSValueID distribution, CSSValueID position, CSSValueID overflow);
 
     CSSValueID m_distribution;
     CSSValueID m_position;
     CSSValueID m_overflow;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSContentDistributionValue, isContentDistributionValue());
 
 } // namespace blink
 
 #endif // CSSContentDistributionValue_h