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

chrome/common/extensions/extension.cc

Index: chrome/common/extensions/extension.cc
diff --git a/chrome/common/extensions/extension.cc b/chrome/common/extensions/extension.cc
index 05493ee0b13f8a802448796907b6c8c69fc66dd9..12294eb5f9f2d85849bdde7405361b69e905f1f6 100644
--- a/chrome/common/extensions/extension.cc
+++ b/chrome/common/extensions/extension.cc
@@ -20,7 +20,6 @@
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "base/version.h"
-#include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "chrome/common/extensions/manifest.h"
@@ -29,7 +28,7 @@
 #include "chrome/common/extensions/permissions/permission_set.h"
 #include "chrome/common/extensions/permissions/permissions_data.h"
 #include "chrome/common/extensions/permissions/permissions_info.h"
-#include "chrome/common/url_constants.h"
+#include "content/public/common/url_constants.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/error_utils.h"
 #include "extensions/common/id_util.h"
@@ -185,11 +184,6 @@ bool Extension::IdIsValid(const std::string& id) {
   return true;
 }
 
-// static
-bool Extension::IsExtension(const base::FilePath& file_name) {
-  return file_name.MatchesExtension(chrome::kExtensionFileExtension);
-}
-
 Manifest::Type Extension::GetType() const {
   return converted_from_user_script() ?
       Manifest::TYPE_USER_SCRIPT : manifest_->type();