Remove //chrome/android:chrome alias

Downstream rename is now complete.

Bug: 731186
Change-Id: I78be4e134d0a4ea0cf98c714f92d4835902de5e9
Reviewed-on: https://chromium-review.googlesource.com/684956Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504437}

chrome/android/BUILD.gn

@@ -702,13 +702,6 @@ jinja_template_resources("chrome_sync_shell_apk_template_resources") {
   variables = chrome_sync_shell_jinja_variables
 }
 
-# TODO(agrieve): Delete target once downstream references are removed.
-group("chrome") {
-  public_deps = [
-    ":libchrome",
-  ]
-}
-
 shared_library("libchrome") {
   sources = [
     "../app/android/chrome_main_delegate_android_initializer.cc",