Run dartfmt on all files under runtime.

runtime/observatory/tests/observatory_ui/mocks/objects/instance.dart

Index: runtime/observatory/tests/observatory_ui/mocks/objects/instance.dart
diff --git a/runtime/observatory/tests/observatory_ui/mocks/objects/instance.dart b/runtime/observatory/tests/observatory_ui/mocks/objects/instance.dart
index 301fec509371b05b653f0db6a9dbd47a84e41d7f..aa72df2125d8ceebf0b97272b06b4fe39993f694 100644
--- a/runtime/observatory/tests/observatory_ui/mocks/objects/instance.dart
+++ b/runtime/observatory/tests/observatory_ui/mocks/objects/instance.dart
@@ -18,12 +18,19 @@ class InstanceRefMock implements M.InstanceRef {
   final M.FunctionRef closureFunction;
   final M.ContextRef closureContext;
 
-  const InstanceRefMock({this.id: 'instance-id', this.name: 'instance-name',
-                         this.kind: M.InstanceKind.vNull, this.clazz,
-                         this.valueAsString: 'null',
-                         this.valueAsStringIsTruncated, this.length,
-                         this.typeClass, this.parameterizedClass, this.pattern,
-                         this.closureFunction, this.closureContext});
+  const InstanceRefMock(
+      {this.id: 'instance-id',
+      this.name: 'instance-name',
+      this.kind: M.InstanceKind.vNull,
+      this.clazz,
+      this.valueAsString: 'null',
+      this.valueAsStringIsTruncated,
+      this.length,
+      this.typeClass,
+      this.parameterizedClass,
+      this.pattern,
+      this.closureFunction,
+      this.closureContext});
 }
 
 class InstanceMock implements M.Instance {
@@ -65,20 +72,42 @@ class InstanceMock implements M.Instance {
   final M.InstanceRef oneByteBytecode;
   final M.InstanceRef twoByteBytecode;
 
-  const InstanceMock({this.id: 'instance-id', this.name: 'instance-name',
-                      this.vmName: 'instance-vmName',
-                      this.kind: M.InstanceKind.vNull,
-                      this.clazz: const ClassRefMock(), this.size: 0,
-                      this.valueAsString: 'null', this.valueAsStringIsTruncated,
-                      this.length, this.typeClass, this.parameterizedClass,
-                      this.pattern, this.closureFunction, this.closureContext,
-                      this.offset, this.count, this.typedElements, this.fields,
-                      this.nativeFields, this.elements, this.associations,
-                      this.key, this.value, this.referent, this.typeArguments,
-                      this.parameterIndex, this.targetType, this.bound,
-                      this.activationBreakpoint, this.isCaseSensitive,
-                      this.isMultiLine, this.oneByteFunction,
-                      this.twoByteFunction, this.externalOneByteFunction,
-                      this.externalTwoByteFunction, this.oneByteBytecode,
-                      this.twoByteBytecode});
+  const InstanceMock(
+      {this.id: 'instance-id',
+      this.name: 'instance-name',
+      this.vmName: 'instance-vmName',
+      this.kind: M.InstanceKind.vNull,
+      this.clazz: const ClassRefMock(),
+      this.size: 0,
+      this.valueAsString: 'null',
+      this.valueAsStringIsTruncated,
+      this.length,
+      this.typeClass,
+      this.parameterizedClass,
+      this.pattern,
+      this.closureFunction,
+      this.closureContext,
+      this.offset,
+      this.count,
+      this.typedElements,
+      this.fields,
+      this.nativeFields,
+      this.elements,
+      this.associations,
+      this.key,
+      this.value,
+      this.referent,
+      this.typeArguments,
+      this.parameterIndex,
+      this.targetType,
+      this.bound,
+      this.activationBreakpoint,
+      this.isCaseSensitive,
+      this.isMultiLine,
+      this.oneByteFunction,
+      this.twoByteFunction,
+      this.externalOneByteFunction,
+      this.externalTwoByteFunction,
+      this.oneByteBytecode,
+      this.twoByteBytecode});
 }