Remove an unused dep in a java rule

Author: shs96c

java/server/src/org/openqa/grid/BUCK

@@ -27,7 +27,6 @@ java_library(name = 'grid',
     '//java/server/src/org/openqa/selenium/remote/server/jmx:jmx',
     '//third_party/java/beust:jcommander',
     '//third_party/java/guava:guava',
-    '//third_party/java/httpcomponents:httpclient',
     '//third_party/java/jcip:jcip-annotations',
     '//third_party/java/jetty:jetty',
     '//third_party/java/servlet:javax.servlet-api',