Add missing (and remove superfluous) 'explicit' from constructors.

base/memory/ref_counted_memory.h

 // Copyright (c) 2012 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 BASE_MEMORY_REF_COUNTED_MEMORY_H_
 #define BASE_MEMORY_REF_COUNTED_MEMORY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 44 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RefCountedStaticMemory);
 };
 
 // An implementation of RefCountedMemory, where we own our the data in a
 // vector.
 class BASE_EXPORT RefCountedBytes : public RefCountedMemory {
  public:
   RefCountedBytes();
 
   // Constructs a RefCountedBytes object by _copying_ from |initializer|.
-  RefCountedBytes(const std::vector<unsigned char>& initializer);
+  explicit RefCountedBytes(const std::vector<unsigned char>& initializer);
 
   // Constructs a RefCountedBytes object by performing a swap. (To non
   // destructively build a RefCountedBytes, use the constructor that takes a
   // vector.)
   static RefCountedBytes* TakeVector(std::vector<unsigned char>* to_destroy);
 
   // Overridden from RefCountedMemory:
   virtual const unsigned char* front() const OVERRIDE;
   virtual size_t size() const OVERRIDE;
 
@@ skipping 30 matching lines @@
   virtual ~RefCountedString();
 
   std::string data_;
 
   DISALLOW_COPY_AND_ASSIGN(RefCountedString);
 };
 
 }  // namespace base
 
 #endif  // BASE_MEMORY_REF_COUNTED_MEMORY_H_