Unify logic of stack trace generation for extension errors

extensions/renderer/resources/last_error.js

Index: extensions/renderer/resources/last_error.js
diff --git a/extensions/renderer/resources/last_error.js b/extensions/renderer/resources/last_error.js
index 8d53371827acd01eeaa12840bd71497b5bb90120..f0f091de71b8441888496ac9668094ce9e49b5d6 100644
--- a/extensions/renderer/resources/last_error.js
+++ b/extensions/renderer/resources/last_error.js
@@ -24,7 +24,7 @@ function set(name, message, stack, targetChrome) {
     errorMessage += '\n' + stack;
 
   if (!targetChrome)
-    throw new Error('No chrome object to set error: ' + errorMessage);
+    throw new $Error.self('No chrome object to set error: ' + errorMessage);
   clear(targetChrome);  // in case somebody has set a sneaky getter/setter
 
   var errorObject = { message: message };
@@ -65,7 +65,7 @@ function hasAccessed(targetChrome) {
  */
 function hasError(targetChrome) {
   if (!targetChrome)
-    throw new Error('No target chrome to check');
+    throw new $Error.self('No target chrome to check');
 
   assertRuntimeIsAvailable();
   if ('lastError' in targetChrome.runtime)
@@ -79,7 +79,7 @@ function hasError(targetChrome) {
  */
 function clear(targetChrome) {
   if (!targetChrome)
-    throw new Error('No target chrome to clear error');
+    throw new $Error.self('No target chrome to clear error');
 
   if (GetAvailability('extension.lastError').is_available)
    delete targetChrome.extension.lastError;
@@ -94,11 +94,11 @@ function assertRuntimeIsAvailable() {
   // some reason? Add debugging for http://crbug.com/258526.
   var runtimeAvailability = GetAvailability('runtime.lastError');
   if (!runtimeAvailability.is_available) {
-    throw new Error('runtime.lastError is not available: ' +
+    throw new $Error.self('runtime.lastError is not available: ' +
                     runtimeAvailability.message);
   }
   if (!chrome.runtime)
-    throw new Error('runtime namespace is null or undefined');
+    throw new $Error.self('runtime namespace is null or undefined');
 }
 
 /**