ExtensionOptionsGuest: Fixed spacing

BUG=none
TBR=fsamuel@chromium.org

Review URL: https://codereview.chromium.org/517593002

Cr-Commit-Position: refs/heads/master@{#292393}

chrome/browser/guest_view/extension_options/extension_options_guest.cc

@@ -132,7 +132,7 @@ const char* ExtensionOptionsGuest::GetAPINamespace() const {
 }
 
 int ExtensionOptionsGuest::GetTaskPrefix() const {
- return IDS_EXTENSION_TASK_MANAGER_EXTENSIONOPTIONS_TAG_PREFIX;
+  return IDS_EXTENSION_TASK_MANAGER_EXTENSIONOPTIONS_TAG_PREFIX;
 }
 
 content::WebContents* ExtensionOptionsGuest::GetAssociatedWebContents() const {