Remove an unnecessary forward declaration of ProxyScriptFetcher.

R=eroman@chromium.org
BUG=none
TEST=no compilation errors

Review URL: http://codereview.chromium.org/7497052

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96123 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/io_thread.h

@@ -43,7 +43,6 @@ class HttpAuthHandlerFactory;
 class HttpTransactionFactory;
 class NetworkDelegate;
 class ProxyConfigService;
-class ProxyScriptFetcher;
 class ProxyService;
 class SSLConfigService;
 class URLRequestContext;