Remove explicit keyword from multi-argument constructors

chrome/browser/upgrade_detector_impl.cc

Index: chrome/browser/upgrade_detector_impl.cc
diff --git a/chrome/browser/upgrade_detector_impl.cc b/chrome/browser/upgrade_detector_impl.cc
index 1619e0a8bc683dda68e0299a365379ad66ef2ed3..d6fa033944367e3b32ab491990ca2de9a35a947b 100644
--- a/chrome/browser/upgrade_detector_impl.cc
+++ b/chrome/browser/upgrade_detector_impl.cc
@@ -63,8 +63,7 @@ int GetCheckForUpgradeEveryMs() {
 // callback task. Otherwise it just deletes the task.
 class DetectUpgradeTask : public Task {
  public:
-  explicit DetectUpgradeTask(Task* upgrade_detected_task,
-                             bool* is_unstable_channel)
+  DetectUpgradeTask(Task* upgrade_detected_task, bool* is_unstable_channel)
       : upgrade_detected_task_(upgrade_detected_task),
         is_unstable_channel_(is_unstable_channel) {
   }