Adding missing include for base/bind.h

This code uses base::Bind and in default configurations
"base/bind.h" is included through
chrome/browser/extensions/extension_service.h ->
chrome/browser/extensions/blacklist.h ->
chrome/browser/safe_browsing/database_manager.h ->
chrome/browser/safe_browsing/protocol_manager.h ->
...

but in my configuration the code needs to be good code and include
headers for code it uses itself.

BUG=

Review URL: https://codereview.chromium.org/838003003

Cr-Commit-Position: refs/heads/master@{#310549}
1 file changed