[Extensions Cleanup] Rename ExtensionErrorReporter

Rename ExtensionErrorReporter to LoadErrorReporter, and move it into
the extensions:: namespace. This is more accurate, since it only handles
extension load errors, rather than generic errors, and also helps
differentiate it from the ErrorConsole.

Bug: 134010
[email protected] (apps)
[email protected] (c/b/ui)

Change-Id: Ie4c398634674c8a041e0b621c331408483d8bb8c
Reviewed-on: https://chromium-review.googlesource.com/820973
Commit-Queue: Devlin <[email protected]>
Reviewed-by: catmullings <[email protected]>
Cr-Commit-Position: refs/heads/master@{#524577}
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 94426cd..ab55eb7 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -1143,8 +1143,7 @@
 // (and also, on Windows, in the registry) and this code will periodically
 // check that location for a .crx file, which it will then install locally if
 // a new version is available.
-// Errors are reported through ExtensionErrorReporter. Success is not
-// reported.
+// Errors are reported through LoadErrorReporter. Success is not reported.
 void ExtensionService::CheckForExternalUpdates() {
   if (external_updates_disabled_for_test_)
     return;