Consistently use "use strict" where possible.

src/liveedit-debugger.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // LiveEdit feature implementation. The script should be executed after
 // debug-debugger.js.
 
 // A LiveEdit namespace. It contains functions that modifies JavaScript code
 // according to changes of script source (if possible).
 //
 // When new script source is put in, the difference is calculated textually,
 // in form of list of delete/add/change chunks. The functions that include
 // change chunk(s) get recompiled, or their enclosing functions are
 // recompiled instead.
 // If the function may not be recompiled (e.g. it was completely erased in new
 // version of the script) it remains unchanged, but the code that could
 // create a new instance of this function goes away. An old version of script
 // is created to back up this obsolete function.
 // All unchanged functions have their positions updated accordingly.
 //
 // LiveEdit namespace is declared inside a single function constructor.
+
+"use strict";
+
 Debug.LiveEdit = new function() {
 
   // Forward declaration for minifier.
   var FunctionStatus;
 
   var NEEDS_STEP_IN_PROPERTY_NAME = "stack_update_needs_step_in";
 
   // Applies the change to the script.
   // The change is in form of list of chunks encoded in a single array as
   // a series of triplets (pos1_start, pos1_end, pos2_end)
@@ skipping 914 matching lines @@
       BLOCKED_ON_ACTIVE_STACK: 2,
       BLOCKED_ON_OTHER_STACK: 3,
       BLOCKED_UNDER_NATIVE_CODE: 4,
       REPLACED_ON_ACTIVE_STACK: 5,
       BLOCKED_UNDER_GENERATOR: 6,
       BLOCKED_ACTIVE_GENERATOR: 7
   };
 
   FunctionPatchabilityStatus.SymbolName = function(code) {
     var enumeration = FunctionPatchabilityStatus;
-    for (name in enumeration) {
+    for (var name in enumeration) {
       if (enumeration[name] == code) {
         return name;
       }
     }
   };
 
 
   // A logical failure in liveedit process. This means that change_log
   // is valid and consistent description of what happened.
   function Failure(message) {
@@ skipping 146 matching lines @@
   // Function is public.
   this.RestartFrame = RestartFrame;
 
   // Functions are public for tests.
   this.TestApi = {
     PosTranslator: PosTranslator,
     CompareStrings: CompareStrings,
     ApplySingleChunkPatch: ApplySingleChunkPatch
   };
 };