Fix last remaining failing dart inspector layout test. Simplify scope-variables.html to not reach i…

LayoutTests/dart/inspector/scope-variables-expected.txt

 Example div
 
 Running: testScopeChain
 Set timer for test function.
 Script execution paused.
 Call stack:
     0) handleMessage2 (scope-variables.dart:24)
     1) handleMessage (scope-variables.dart:12)
-    2) Function._apply@915557746 (dart:core-patch/function_patch.dart:7)
+    2) Function._apply(VM_PRIVATE_MANGLING) (dart:core-patch/function_patch.dart:7)
     3) Function.apply (dart:core-patch/function_patch.dart:28)
-    4) _CreateDartFunctionForInteropIgnoreThis@342649749.call (dart:js:xxxx)
-
-Dump scope sections:
+    4) _CreateDartFunctionForInteropIgnoreThis(VM_PRIVATE_MANGLING).call (dart:js:xxxx)
+Scope variables sidebar pane:
 Local
     _s: "foo"
     a1: [Instance of A, d = 3.14]
     a2: null
     b: false
     d: 1.618
     event: [object MessageEvent]
     i: 42
     l: [1, 2, 3]
-scope_variables_testLibrary
+Library
     A: class A
     globalArrayVariable: [3, 1, 4, 1, 5, 9]
     globalMapVariable: {foo: bar, baz: 42}
     globalVariable: "globalString"
-    handleMessage: handleMessage(event)
-    handleMessage2: handleMessage2(event)
-    main: main()
-scope-variables.dart(DEFAULT_ISOLATE_NAME_SUFFIX)Isolate
+    handleMessage: (event)
+    handleMessage2: (event)
+    main: ()
+Isolate
     dart:_blink: dart.dom._blink(VM_PRIVATE_MANGLING)
     dart:_builtin: builtin
     dart:_internal: dart._internal(VM_PRIVATE_MANGLING)
     dart:_vmservice: dart._vmservice(VM_PRIVATE_MANGLING)
     dart:async: dart.async
     dart:collection: dart.collection
     dart:convert: dart.convert
     dart:core: dart.core
     dart:developer: dart.developer
     dart:html: dart.dom.html
     dart:html_common: html_common
     dart:indexed_db: dart.dom.indexed_db
     dart:io: dart.io
     dart:isolate: dart.isolate
     dart:js: dart.js
     dart:math: dart.math
     dart:mirrors: dart.mirrors
     dart:nativewrappers: dart.nativewrappers
     dart:profiler: dart.profiler
     dart:svg: dart.dom.svg
     dart:typed_data: dart.typed_data
     dart:vmserviceio: dart:vmserviceio
     dart:web_audio: dart.dom.web_audio
     dart:web_gl: dart.dom.web_gl
     dart:web_sql: dart.dom.web_sql
     (SOURCE_LOCATION): metadata
     (SOURCE_LOCATION): snapshot
     (SOURCE_LOCATION): scope_variables_test
     (SOURCE_LOCATION): (SOURCE_LOCATION)
-Inspected value toString(): [Instance of A, d = 3.14]
-Result of calling invalid function. value: undefined. exception thrown: true
 Script execution resumed.