blink: use php7 for web tests on 10.14

php5 is unsupported, same as 10.13.

Bug: 892187
Change-Id: I52bc19b4f6ea8408093b7fcc61f6fe5153c984fd
Reviewed-on: https://chromium-review.googlesource.com/c/1335947Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608349}

third_party/blink/tools/blinkpy/web_tests/port/mac.py

@@ -95,7 +95,7 @@ class MacPort(base.Port):
 
     def path_to_apache_config_file(self):
         config_file_basename = 'apache2-httpd-' + self._apache_version()
-        if self.host.platform.os_version == 'mac10.13':
+        if self.host.platform.os_version in ['mac10.13', 'mac10.14']:
             config_file_basename += '-php7'
         return self._filesystem.join(self.apache_config_directory(), config_file_basename + '.conf')