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

jingle/glue/thread_wrapper_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/bind.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
 #include "base/threading/thread.h"
 #include "jingle/glue/thread_wrapper.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 28 matching lines @@
       arg->pdata == data;
 }
 
 ACTION(DeleteMessageData) {
   delete arg0->pdata;
 }
 
 // Helper class used in the Dispose test.
 class DeletableObject {
  public:
-  DeletableObject(bool* deleted)
+  explicit DeletableObject(bool* deleted)
       : deleted_(deleted) {
     *deleted = false;
   }
 
   ~DeletableObject() {
     *deleted_ = true;
   }
 
  private:
   bool* deleted_;
@@ skipping 237 matching lines @@
 
 TEST_F(ThreadWrapperTest, Dispose) {
   bool deleted_;
   thread_->Dispose(new DeletableObject(&deleted_));
   EXPECT_FALSE(deleted_);
   message_loop_.RunUntilIdle();
   EXPECT_TRUE(deleted_);
 }
 
 }  // namespace jingle_glue