This patch is the rest of the lint cleanup minus the other open issue.

chrome/common/notification_details.h

Index: chrome/common/notification_details.h
diff --git a/chrome/common/notification_details.h b/chrome/common/notification_details.h
index ee1011160c8b0adeaf2307def7ab7b642982b853..65f2b2b7fbfec19b0fbd07978aa13d18f209285b 100644
--- a/chrome/common/notification_details.h
+++ b/chrome/common/notification_details.h
@@ -33,7 +33,7 @@ class NotificationDetails {
   }
 
  protected:
-  NotificationDetails(const void* ptr) : ptr_(ptr) {}
+  explicit NotificationDetails(const void* ptr) : ptr_(ptr) {}
 
   // Declaring this const allows Details<T> to be used with both T = Foo and
   // T = const Foo.
@@ -43,8 +43,8 @@ class NotificationDetails {
 template <class T>
 class Details : public NotificationDetails {
  public:
-  Details(T* ptr) : NotificationDetails(ptr) {}
-  Details(const NotificationDetails& other)
+  explicit Details(T* ptr) : NotificationDetails(ptr) {}
+  explicit Details(const NotificationDetails& other)
     : NotificationDetails(other) {}
 
   T* operator->() const { return ptr(); }