Add a convenience typedef LazyInstance<T>::Leaky to avoid repeating T.

base/lazy_instance.h

Index: base/lazy_instance.h
diff --git a/base/lazy_instance.h b/base/lazy_instance.h
index ededc73cbbaeba9d426c85e7d85ef4a9be7b0ed6..1702b41cb27c77dee202a4a9d29bf3b2c40fba0c 100644
--- a/base/lazy_instance.h
+++ b/base/lazy_instance.h
@@ -73,6 +73,7 @@ struct DefaultLazyInstanceTraits {
   }
 };
 
+// Use LazyInstance<T>::Leaky for a less-verbose call-site typedef.

[wtc, 2012/01/21 00:51:01]

Nit: would be nice to give an example.  Before I saw your
change to base/lazy_instance_unittest.cc, I didn't understand
this comment completely.

Nit: Is it possible for this convenience typedef to be
named LeakyLazyInstance<T>?

[Ami GONE FROM CHROMIUM, 2012/01/21 01:22:30]

Done.
Not until we adopt c++11 and get template typedefs.
I tried being tricksy with subclassing, but that breaks brace initialization.

 template <typename Type>
 struct LeakyLazyInstanceTraits {
   static const bool kRegisterOnExit = false;
@@ -117,6 +118,10 @@ class LazyInstance {
   // the OnExit member function, where needed.
   // ~LazyInstance() {}
 
+  // Convenience typedef to avoid having to repeat Type for leaky lazy
+  // instances.
+  typedef LazyInstance<Type, LeakyLazyInstanceTraits<Type> > Leaky;
+
   Type& Get() {
     return *Pointer();
   }