Rename //mojo/public/java:bindings -> :bindings_java

and //mojo/public/java:system -> :system_java

This removes a naming exception from the android java targets whitelist
within internal_rules.gni.

BUG=620034

Review-Url: https://codereview.chromium.org/2476683002
Cr-Original-Commit-Position: refs/heads/master@{#429941}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: ed37c92f79b0cfa854cb3a9b1a02a6c89e4699c2

config/android/internal_rules.gni

@@ -40,7 +40,6 @@ _java_target_whitelist = [
   "//device/battery/android:battery_monitor_android",
   "//device/vibration/android:vibration_manager_android",
   "//mojo/public/java:bindings",
-  "//mojo/public/java:system",
   "//third_party/android_tools:emma_device",
   "//third_party/cardboard-java:cardboard-java",
   "//third_party/custom_tabs_client:custom_tabs_client_shared_lib",