Extensions: Move id_util functions to crx_file component.

chrome/browser/extensions/updater/local_extension_cache.cc

Index: chrome/browser/extensions/updater/local_extension_cache.cc
diff --git a/chrome/browser/extensions/updater/local_extension_cache.cc b/chrome/browser/extensions/updater/local_extension_cache.cc
index 34ef19c6a810864734769eb4747a5c256cd45259..5c81e5523aca5d3a4311ed6b6030c83d06be134f 100644
--- a/chrome/browser/extensions/updater/local_extension_cache.cc
+++ b/chrome/browser/extensions/updater/local_extension_cache.cc
@@ -11,8 +11,8 @@
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "base/version.h"
+#include "components/crx_file/id_util.h"
 #include "content/public/browser/browser_thread.h"
-#include "extensions/common/extension.h"
 
 namespace extensions {
 namespace {
@@ -306,7 +306,7 @@ void LocalExtensionCache::BackendCheckCacheContentsInternal(
 
     // Enforce a lower-case id.
     id = base::StringToLowerASCII(id);
-    if (!extensions::Extension::IdIsValid(id)) {
+    if (!crx_file::id_util::IdIsValid(id)) {
       LOG(ERROR) << "Bad extension id in cache: " << id;
       id.clear();
     }