Move ".crx"/".pem" constants and extension_filenames constants into extensions/common/constants.cc.

chrome/common/extensions/extension_file_util.cc

Index: chrome/common/extensions/extension_file_util.cc
diff --git a/chrome/common/extensions/extension_file_util.cc b/chrome/common/extensions/extension_file_util.cc
index 16b1e54f9fb742e80a0fd9718415f6ad3ca83d7b..2ee96433f7dbce37b57d8a5882d54ef001bedb7b 100644
--- a/chrome/common/extensions/extension_file_util.cc
+++ b/chrome/common/extensions/extension_file_util.cc
@@ -18,7 +18,6 @@
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
-#include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/extensions/api/extension_action/action_info.h"
 #include "chrome/common/extensions/extension.h"
@@ -169,7 +168,7 @@ scoped_refptr<Extension> LoadExtension(const base::FilePath& extension_path,
 base::DictionaryValue* LoadManifest(const base::FilePath& extension_path,
                                     std::string* error) {
   base::FilePath manifest_path =
-      extension_path.Append(extensions::kManifestFilename);
+      extension_path.Append(extensions::filenames::kManifestFilename);
   if (!base::PathExists(manifest_path)) {
     *error = l10n_util::GetStringUTF8(IDS_EXTENSION_MANIFEST_UNREADABLE);
     return NULL;
@@ -208,7 +207,8 @@ std::vector<base::FilePath> FindPrivateKeyFiles(
                                  base::FileEnumerator::FILES);
   for (base::FilePath current = traversal.Next(); !current.empty();
        current = traversal.Next()) {
-    if (!current.MatchesExtension(chrome::kExtensionKeyFileExtension))
+    if (!current.MatchesExtension(
+            extensions::filenames::kExtensionKeyFileExtension))
       continue;
 
     std::string key_contents;
@@ -408,7 +408,8 @@ extensions::MessageBundle* LoadMessageBundle(
     std::string* error) {
   error->clear();
   // Load locale information if available.
-  base::FilePath locale_path = extension_path.Append(extensions::kLocaleFolder);
+  base::FilePath locale_path =
+      extension_path.Append(extensions::filenames::kLocaleFolder);
   if (!base::PathExists(locale_path))
     return NULL;
 
@@ -461,8 +462,8 @@ bool CheckForIllegalFilenames(const base::FilePath& extension_path,
                               std::string* error) {
   // Reserved underscore names.
   static const base::FilePath::CharType* reserved_names[] = {
-    extensions::kLocaleFolder,
-    extensions::kPlatformSpecificFolder,
+    extensions::filenames::kLocaleFolder,
+    extensions::filenames::kPlatformSpecificFolder,
     FILE_PATH_LITERAL("__MACOSX"),
   };
   CR_DEFINE_STATIC_LOCAL(