Revert of [Blimp] Adds a headless content shell as a blimp engine. It…

… uses a dummy screen, and is a slimming … (patchset chromium#11 id:200001 of https://codereview.chromium.org/1364463003/ )

Reason for revert:
broke build:

http://build.chromium.org/p/chromium.linux/builders/Linux%20GN%20Clobber/builds/6346

Original issue's description:
> [Blimp] Adds a headless content shell as a blimp engine. It uses a dummy screen, and is a slimming down version of the content shell.
> It loads google.com as the initial URL.
>
> BUG=533592
>
> Committed: https://crrev.com/ce6219fba3471bb7b4d295127eb34e734d14f499
> Cr-Commit-Position: refs/heads/master@{#352902}

TBR=wez@chromium.org,dtrainor@chromium.org,davidben@chromium.org,sky@chromium.org,mark@chromium.org,haibinlu@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=533592

Review URL: https://codereview.chromium.org/1397613002

Cr-Commit-Position: refs/heads/master@{#352949}

blimp/BUILD.gn

@@ -3,6 +3,9 @@
 # found in the LICENSE file.
 
 group("blimp") {
+  # TODO(maniscalco): Remove the testonly attribute once blimp_engine no longer
+  # depends on content_shell (crbug.com/538353).
+  testonly = true
   deps = [
     "//blimp/client:blimp_client",
     "//blimp/common:blimp_common",

blimp/engine/BUILD.gn

@@ -2,65 +2,16 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/config/features.gni")
-import("//build/config/sanitizers/sanitizers.gni")
-import("//build/config/ui.gni")
-import("//tools/grit/repack.gni")
-import("//tools/grit/grit_rule.gni")
-
-repack("pak") {
-  sources = [
-    "$root_gen_dir/blink/public/resources/blink_image_resources_100_percent.pak",
-    "$root_gen_dir/blink/public/resources/blink_resources.pak",
-    "$root_gen_dir/content/app/resources/content_resources_100_percent.pak",
-    "$root_gen_dir/content/app/strings/content_strings_en-US.pak",
-    "$root_gen_dir/content/browser/tracing/tracing_resources.pak",
-    "$root_gen_dir/content/content_resources.pak",
-    "$root_gen_dir/net/net_resources.pak",
-    "$root_gen_dir/ui/resources/ui_resources_100_percent.pak",
-    "$root_gen_dir/ui/resources/webui_resources.pak",
-    "$root_gen_dir/ui/strings/app_locale_settings_en-US.pak",
-    "$root_gen_dir/ui/strings/ui_strings_en-US.pak",
-  ]
-
-  deps = [
-    "//content:resources",
-    "//content/app/resources",
-    "//content/app/strings",
-    "//content/browser/tracing:resources",
-    "//net:net_resources",
-    "//third_party/WebKit/public:image_resources",
-    "//third_party/WebKit/public:resources",
-    "//ui/resources",
-    "//ui/strings",
-  ]
-
-  if (toolkit_views) {
-    deps += [ "//ui/views/resources" ]
-    sources +=
-        [ "$root_gen_dir/ui/views/resources/views_resources_100_percent.pak" ]
-  }
-
-  output = "$root_out_dir/blimp_engine.pak"
-}
-
 if (is_linux) {
-  executable("blimp_engine_app") {
-    sources = [
-      "app/blimp_main.cc",
-    ]
-
-    deps = [
-      ":pak",
-      "//blimp/engine/app",
-    ]
-  }
-
   # A stand-in for the Blimp Engine so we can get the Docker packaging working.
+  #
+  # TODO(maniscalco): Update to use the real engine once it's ready and remove
+  # the testonly attribute (crbug.com/538353).
   group("blimp_engine") {
+    testonly = true
     data_deps = [
-      ":blimp_engine_app",
-      ":pak",
+      "//content/shell:content_shell",
+      "//content/shell:pak",
     ]
   }
 }