Expose base::Callback::IsCancelled via WTF::Function

third_party/WebKit/Source/wtf/FunctionalTest.cpp

Index: third_party/WebKit/Source/wtf/FunctionalTest.cpp
diff --git a/third_party/WebKit/Source/wtf/FunctionalTest.cpp b/third_party/WebKit/Source/wtf/FunctionalTest.cpp
index 03c6e7c6ce0f17aafefc67b7628f06c8eb9dce49..ef6ccc262d4427058172b1d208b0c547a79f5afe 100644
--- a/third_party/WebKit/Source/wtf/FunctionalTest.cpp
+++ b/third_party/WebKit/Source/wtf/FunctionalTest.cpp
@@ -589,9 +589,11 @@ TEST(FunctionalTest, WeakPtr)
     std::unique_ptr<WTF::Closure> bound = WTF::bind(&HasWeakPtrSupport::increment, obj.createWeakPtr(), WTF::unretained(&counter));
 
     (*bound)();
+    EXPECT_FALSE(bound->isCancelled());
     EXPECT_EQ(1, counter);
 
     obj.revokeAll();
+    EXPECT_TRUE(bound->isCancelled());
     (*bound)();
     EXPECT_EQ(1, counter);
 }