Removes MessageLoop::Type checks in favor of IsCurrent on MessageLoops.

base/message_loop/message_loop.h

Index: base/message_loop/message_loop.h
diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
index 74eddaf2fc9f694bc8368bc7e64f8752a905aaef..2388b59b88e41d058887ec6919950caf1e41caca 100644
--- a/base/message_loop/message_loop.h
+++ b/base/message_loop/message_loop.h
@@ -565,6 +565,11 @@ class BASE_EXPORT MessageLoopForUI : public MessageLoop {
     return static_cast<MessageLoopForUI*>(loop);
   }
 
+  static bool IsCurrent() {
+    MessageLoop* loop = MessageLoop::current();
+    return loop && loop->type() == MessageLoop::TYPE_UI;
+  }
+
 #if defined(OS_IOS)
   // On iOS, the main message loop cannot be Run().  Instead call Attach(),
   // which connects this MessageLoop to the UI thread's CFRunLoop and allows
@@ -664,6 +669,11 @@ class BASE_EXPORT MessageLoopForIO : public MessageLoop {
     return static_cast<MessageLoopForIO*>(loop);
   }
 
+  static bool IsCurrent() {
+    MessageLoop* loop = MessageLoop::current();
+    return loop && loop->type() == MessageLoop::TYPE_IO;
+  }
+
   void AddIOObserver(IOObserver* io_observer) {
     pump_io()->AddIOObserver(io_observer);
   }