Really remove elfutils.

A previous commit did part of the job; this finishes it.

Bug: 899208
Change-Id: I174cc64515be0dc01ea17da45915386a4ecdf88e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274462Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Adrian Taylor <adetaylor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783957}

DEPS

@@ -889,11 +889,6 @@ deps = {
   'src/third_party/dom_distiller_js/dist':
     Var('chromium_git') + '/chromium/dom-distiller/dist.git' + '@' + '3093c3e238768ab27ff756bd7563ccbb12129d9f',
 
-  'src/third_party/elfutils/src': {
-      'url': Var('chromium_git') + '/external/elfutils.git' + '@' + '249673729a7e5dbd5de4f3760bdcaa3d23d154d7',
-      'condition': 'checkout_android_native_support',
-  },
-
   'src/third_party/espresso': {
       'packages': [
           {