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

cc/test/scheduler_test_common.h

 // Copyright 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 CC_TEST_SCHEDULER_TEST_COMMON_H_
 #define CC_TEST_SCHEDULER_TEST_COMMON_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/delay_based_time_source.h"
 #include "cc/frame_rate_controller.h"
@@ skipping 97 matching lines @@
         : DelayBasedTimeSource(interval, thread)
     {
     }
     virtual ~FakeDelayBasedTimeSource() { }
 
     base::TimeTicks m_now;
 };
 
 class FakeFrameRateController : public cc::FrameRateController {
 public:
-    FakeFrameRateController(scoped_refptr<cc::TimeSource> timer) : cc::FrameRateController(timer) { }
+    explicit FakeFrameRateController(scoped_refptr<cc::TimeSource> timer) : cc::FrameRateController(timer) { }
 
     int numFramesPending() const { return m_numFramesPending; }
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_SCHEDULER_TEST_COMMON_H_