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

base/synchronization/lock_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/synchronization/lock.h"
 
 #include <stdlib.h>
 
 #include "base/compiler_specific.h"
 #include "base/threading/platform_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 // Basic test to make sure that Acquire()/Release()/Try() don't crash ----------
 
 class BasicLockTestThread : public PlatformThread::Delegate {
  public:
-  BasicLockTestThread(Lock* lock) : lock_(lock), acquired_(0) {}
+  explicit BasicLockTestThread(Lock* lock) : lock_(lock), acquired_(0) {}
 
   virtual void ThreadMain() OVERRIDE {
     for (int i = 0; i < 10; i++) {
       lock_->Acquire();
       acquired_++;
       lock_->Release();
     }
     for (int i = 0; i < 10; i++) {
       lock_->Acquire();
       acquired_++;
@@ skipping 54 matching lines @@
   PlatformThread::Join(handle);
 
   EXPECT_GE(acquired, 20);
   EXPECT_GE(thread.acquired(), 20);
 }
 
 // Test that Try() works as expected -------------------------------------------
 
 class TryLockTestThread : public PlatformThread::Delegate {
  public:
-  TryLockTestThread(Lock* lock) : lock_(lock), got_lock_(false) {}
+  explicit TryLockTestThread(Lock* lock) : lock_(lock), got_lock_(false) {}
 
   virtual void ThreadMain() OVERRIDE {
     got_lock_ = lock_->Try();
     if (got_lock_)
       lock_->Release();
   }
 
   bool got_lock() const { return got_lock_; }
 
  private:
@@ skipping 102 matching lines @@
   MutexLockTestThread::DoStuff(&lock, &value);
 
   PlatformThread::Join(handle1);
   PlatformThread::Join(handle2);
   PlatformThread::Join(handle3);
 
   EXPECT_EQ(4 * 40, value);
 }
 
 }  // namespace base