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

base/threading/non_thread_safe_unittest.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 "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/threading/simple_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 29 matching lines @@
   static void MethodOnDifferentThreadImpl();
   static void DestructorOnDifferentThreadImpl();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NonThreadSafeClass);
 };
 
 // Calls NonThreadSafeClass::DoStuff on another thread.
 class CallDoStuffOnThread : public SimpleThread {
  public:
-  CallDoStuffOnThread(NonThreadSafeClass* non_thread_safe_class)
+  explicit CallDoStuffOnThread(NonThreadSafeClass* non_thread_safe_class)
       : SimpleThread("call_do_stuff_on_thread"),
         non_thread_safe_class_(non_thread_safe_class) {
   }
 
   virtual void Run() OVERRIDE {
     non_thread_safe_class_->DoStuff();
   }
 
  private:
   NonThreadSafeClass* non_thread_safe_class_;
 
   DISALLOW_COPY_AND_ASSIGN(CallDoStuffOnThread);
 };
 
 // Deletes NonThreadSafeClass on a different thread.
 class DeleteNonThreadSafeClassOnThread : public SimpleThread {
  public:
-  DeleteNonThreadSafeClassOnThread(NonThreadSafeClass* non_thread_safe_class)
+  explicit DeleteNonThreadSafeClassOnThread(
+      NonThreadSafeClass* non_thread_safe_class)
       : SimpleThread("delete_non_thread_safe_class_on_thread"),
         non_thread_safe_class_(non_thread_safe_class) {
   }
 
   virtual void Run() OVERRIDE {
     non_thread_safe_class_.reset();
   }
 
  private:
   scoped_ptr<NonThreadSafeClass> non_thread_safe_class_;
@@ skipping 78 matching lines @@
   NonThreadSafeClass::DestructorOnDifferentThreadImpl();
 }
 #endif  // ENABLE_NON_THREAD_SAFE
 
 #endif  // GTEST_HAS_DEATH_TEST || !ENABLE_NON_THREAD_SAFE
 
 // Just in case we ever get lumped together with other compilation units.
 #undef ENABLE_NON_THREAD_SAFE
 
 }  // namespace base