bug 1496987: geckodriver: turn off arm7hf builds; r=automatedtester

The intent to turn off ARMv7 HF builds before
the geckodriver 1.0 release was announced in
https://lists.mozilla.org/pipermail/tools-marionette/2018-September/000035.html.

In order to create as few surprises as possible before 1.0, we
should turn off ARMv7 HF builds on Travis first.

Differential Revision: https://phabricator.services.mozilla.com/D7964

--HG--
extra : moz-landing-system : lando

testing/geckodriver/.travis.yml

@@ -13,17 +13,6 @@ before_install:
 
 matrix:
   include:
-    - os: linux
-      env:
-        - TARGET=armv7-unknown-linux-gnueabihf
-        - NAME=arm7hf
-        - EXT=tar.gz
-      addons:
-        apt:
-          packages: &armhf
-          - gcc-arm-linux-gnueabihf
-          - libc6-armhf-cross
-          - libc6-dev-armhf-cross
     - os: linux
       env:
         - TARGET=x86_64-unknown-linux-musl