DevTools: simplify the async instrumentation harness.

third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-mutation-observer-expected.txt

Index: third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-mutation-observer-expected.txt
diff --git a/third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-mutation-observer-expected.txt b/third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-mutation-observer-expected.txt
index 645b7ebb646068a8efcf9d510e03e48d07dc3602..bc2f27c742b4ed7444b29fe5ddd736aa319ada69 100644
--- a/third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-mutation-observer-expected.txt
+++ b/third_party/WebKit/LayoutTests/inspector/sources/debugger-async/async-callstack-mutation-observer-expected.txt
@@ -4,7 +4,7 @@ Set timer for test function.
 Captured call stacks in no particular order:
 Call stack:
     0) mutationCallback (async-callstack-mutation-observer.html:21)
-    [Mutation]
+    [attributes]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)
     [setTimeout]
@@ -15,7 +15,7 @@ Call stack:
 
 Call stack:
     0) mutationCallback (async-callstack-mutation-observer.html:21)
-    [Mutation]
+    [childList]
     0) doMutations2 (async-callstack-mutation-observer.html:64)
     1) timeout2 (async-callstack-mutation-observer.html:57)
     [setTimeout]
@@ -28,10 +28,10 @@ Call stack:
 
 Call stack:
     0) nestedMutationCallback (async-callstack-mutation-observer.html:28)
-    [Mutation]
+    [attributes]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) mutationCallback (async-callstack-mutation-observer.html:20)
-    [Mutation]
+    [attributes]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)
     [setTimeout]
@@ -42,15 +42,15 @@ Call stack:
 
 Call stack:
     0) nestedMutationCallback (async-callstack-mutation-observer.html:28)
-    [Mutation]
+    [childList]
     0) doMutations2 (async-callstack-mutation-observer.html:64)
     1) timeoutFromNestedMutation (async-callstack-mutation-observer.html:76)
     [setTimeout]
     0) nestedMutationCallback (async-callstack-mutation-observer.html:30)
-    [Mutation]
+    [attributes]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) mutationCallback (async-callstack-mutation-observer.html:20)
-    [Mutation]
+    [attributes]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)
 
@@ -58,7 +58,7 @@ Call stack:
     0) timeoutFromMutation (async-callstack-mutation-observer.html:70)
     [setTimeout]
     0) mutationCallback (async-callstack-mutation-observer.html:23)
-    [Mutation]
+    [attributes]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)
     [setTimeout]
@@ -71,10 +71,10 @@ Call stack:
     0) timeoutFromNestedMutation (async-callstack-mutation-observer.html:75)
     [setTimeout]
     0) nestedMutationCallback (async-callstack-mutation-observer.html:30)
-    [Mutation]
+    [attributes]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) mutationCallback (async-callstack-mutation-observer.html:20)
-    [Mutation]
+    [attributes]
     0) doMutations1 (async-callstack-mutation-observer.html:50)
     1) timeout1 (async-callstack-mutation-observer.html:44)
     [setTimeout]