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

gpu/command_buffer/service/feature_info.cc

 // 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.
 
 #include "gpu/command_buffer/service/feature_info.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
@@ skipping 13 matching lines @@
 struct FormatInfo {
   GLenum format;
   const GLenum* types;
   size_t count;
 };
 
 class StringSet {
  public:
   StringSet() {}
 
-  StringSet(const char* s) {
+  explicit StringSet(const char* s) {
     Init(s);
   }
 
-  StringSet(const std::string& str) {
+  explicit StringSet(const std::string& str) {
     Init(str);
   }
 
   void Init(const char* s) {
     std::string str(s ? s : "");
     Init(str);
   }
 
   void Init(const std::string& str) {
     std::vector<std::string> tokens;
@@ skipping 660 matching lines @@
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu