Move ExtensionService::GetExtensionById() to ExtensionRegistry

extensions/browser/extension_registry.cc

Index: extensions/browser/extension_registry.cc
diff --git a/extensions/browser/extension_registry.cc b/extensions/browser/extension_registry.cc
index f4bd91e145bff6c4387b74ba7f35614de5a94651..a0325abf13a196c7cf5022d5fabd5f5a93831751 100644
--- a/extensions/browser/extension_registry.cc
+++ b/extensions/browser/extension_registry.cc
@@ -4,6 +4,7 @@
 
 #include "extensions/browser/extension_registry.h"
 
+#include "base/strings/string_util.h"
 #include "extensions/browser/extension_registry_factory.h"
 
 namespace extensions {
@@ -16,6 +17,32 @@ ExtensionRegistry* ExtensionRegistry::Get(content::BrowserContext* context) {
   return ExtensionRegistryFactory::GetForBrowserContext(context);
 }
 
+const Extension* ExtensionRegistry::GetExtensionById(const std::string& id,
+                                                     int include_mask) const {
+  std::string lowercase_id = StringToLowerASCII(id);
+  if (include_mask & INCLUDE_ENABLED) {
+    const Extension* extension = enabled_extensions_.GetByID(lowercase_id);
+    if (extension)
+      return extension;
+  }
+  if (include_mask & INCLUDE_DISABLED) {
+    const Extension* extension = disabled_extensions_.GetByID(lowercase_id);
+    if (extension)
+      return extension;
+  }
+  if (include_mask & INCLUDE_TERMINATED) {
+    const Extension* extension = terminated_extensions_.GetByID(lowercase_id);
+    if (extension)
+      return extension;
+  }
+  if (include_mask & INCLUDE_BLACKLISTED) {
+    const Extension* extension = blacklisted_extensions_.GetByID(lowercase_id);
+    if (extension)
+      return extension;
+  }
+  return NULL;
+}
+
 bool ExtensionRegistry::AddEnabled(
     const scoped_refptr<const Extension>& extension) {
   return enabled_extensions_.Insert(extension);