[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/unpacked_installer.h b/chrome/browser/extensions/unpacked_installer.h
index e30e6bd9..266f83a 100644
--- a/chrome/browser/extensions/unpacked_installer.h
+++ b/chrome/browser/extensions/unpacked_installer.h
@@ -43,7 +43,7 @@
 
   // Loads the extension from the directory |extension_path|, which is
   // the top directory of a specific extension where its manifest file lives.
-  // Errors are reported through ExtensionErrorReporter. On success,
+  // Errors are reported through LoadErrorReporter. On success,
   // ExtensionService::AddExtension() is called.
   void Load(const base::FilePath& extension_path);