Remove explicit keyword from multi-argument constructors

chrome_frame/custom_sync_call_context.h

 // Copyright (c) 2011 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 CHROME_FRAME_CUSTOM_SYNC_CALL_CONTEXT_H_
 #define CHROME_FRAME_CUSTOM_SYNC_CALL_CONTEXT_H_
 
 #include <vector>
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 47 matching lines @@
  private:
   scoped_refptr<ChromeFrameAutomationClient> client_;
 };
 
 // Class that maintains contextual information for the unload operation, i.e.
 // when the user attempts to navigate away from a page rendered in ChromeFrame.
 class UnloadContext
     : public SyncMessageReplyDispatcher::SyncMessageCallContext {
  public:
   typedef Tuple1<bool> output_type;
-  explicit UnloadContext(base::WaitableEvent* unload_done, bool* should_unload)
+  UnloadContext(base::WaitableEvent* unload_done, bool* should_unload)
       : should_unload_(should_unload),
         unload_done_(unload_done) {
   }
 
   void Completed(bool should_unload) {
     *should_unload_ = should_unload;
     unload_done_->Signal();
     should_unload_ = NULL;
     unload_done_ = NULL;
     // This object will be destroyed after this. Cannot access any members
     // on returning from this function.
   }
 
  private:
   base::WaitableEvent* unload_done_;
   bool* should_unload_;
 };
 
 #endif  // CHROME_FRAME_CUSTOM_SYNC_CALL_CONTEXT_H_