Fix failed build

crrev.com/6f8b5118 adjusted location of callback helpers.

TBR=danakj@chromium.org
NOTRY=true

Change-Id: I4af7bd6b70c4716db7059b16ec7dd7843fc0fd21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533026Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Auto-Submit: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826389}

content/browser/webui/web_ui_main_frame_observer.cc

@@ -11,7 +11,7 @@
 #include "content/public/browser/navigation_handle.h"
 
 #if defined(OS_LINUX) || defined(OS_CHROMEOS)
-#include "base/bind_helpers.h"
+#include "base/callback_helpers.h"
 #include "base/feature_list.h"
 #include "base/logging.h"
 #include "base/strings/strcat.h"