Set enable_app_list=1 now only on ChromeOS.

testing/buildbot/chromium.win.json

Index: testing/buildbot/chromium.win.json
diff --git a/testing/buildbot/chromium.win.json b/testing/buildbot/chromium.win.json
index 80569ac307f5e64e5d50d1e2afffc942a36cfeb9..4d0315b21dcebfb0ac5f4de9fc31581316a17c86 100644
--- a/testing/buildbot/chromium.win.json
+++ b/testing/buildbot/chromium.win.json
@@ -11,18 +11,6 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "app_list_presenter_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
-        "test": "app_list_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "app_shell_unittests"
       },
       {
@@ -445,18 +433,6 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "app_list_presenter_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
-        "test": "app_list_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "app_shell_unittests"
       },
       {
@@ -886,18 +862,6 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "app_list_presenter_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
-        "test": "app_list_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "app_shell_unittests"
       },
       {
@@ -1319,18 +1283,6 @@
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "app_list_presenter_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
-        "test": "app_list_unittests"
-      },
-      {
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
         "test": "app_shell_unittests"
       },
       {
@@ -2123,8 +2075,6 @@
   "Win8 Aura": {
     "additional_compile_targets": [
       "accessibility_unittests",
-      "app_list_unittests",
-      "app_list_presenter_unittests",
       "app_shell_unittests",
       "ash_shell_with_content",
       "ash_unittests",