Remove test_isolation_outdir references.

It's not used anymore.

TBR=vadimsh@chromium.org
BUG=497135

Review URL: https://codereview.chromium.org/1176463003

Cr-Original-Commit-Position: refs/heads/master@{#333529}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 24187bcbb3487eff94af356a32a772528f6cc0aa

common.gypi

@@ -638,9 +638,6 @@
       # with one of those tools.
       'build_for_tool%': '',
 
-      # If no directory is specified then a temporary directory will be used.
-      'test_isolation_outdir%': '',
-
       'wix_path%': '<(DEPTH)/third_party/wix',
 
       # Supervised users are enabled by default.
@@ -1189,7 +1186,6 @@
     'linux_use_debug_fission%': '<(linux_use_debug_fission)',
     'use_canvas_skia%': '<(use_canvas_skia)',
     'test_isolation_mode%': '<(test_isolation_mode)',
-    'test_isolation_outdir%': '<(test_isolation_outdir)',
     'enable_basic_printing%': '<(enable_basic_printing)',
     'enable_print_preview%': '<(enable_print_preview)',
     'enable_spellcheck%': '<(enable_spellcheck)',

isolate.gypi

@@ -110,9 +110,6 @@
             '--extra-variable', 'mac_product_name=<(mac_product_name)',
           ],
         }],
-        ["test_isolation_outdir!=''", {
-          'action': [ '--isolate-server', '<(test_isolation_outdir)' ],
-        }],
         ["test_isolation_mode == 'prepare'", {
           'outputs': [
             '<(PRODUCT_DIR)/<(RULE_INPUT_ROOT).isolated.gen.json',