Revert "[inspector] added inspector test runner [part 3-5]"

test/inspector/BUILD.gn

 # Copyright 2016 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("../../gni/v8.gni")
 
 v8_executable("inspector-test") {
   testonly = true
 
   sources = [
     "inspector-impl.cc",
     "inspector-impl.h",
-    "inspector-test.cc",
     "task-runner.cc",
     "task-runner.h",
   ]
 
   configs = [
     "../..:external_config",
     "../..:internal_config_base",
   ]
 
   deps = [
     "../..:v8_libplatform",
     "//build/config/sanitizers:deps",
     "//build/win:default_exe_manifest",
   ]
 
   if (is_component_build) {
     # inspector-test can't be built against a shared library, so we
     # need to depend on the underlying static target in that case.
     deps += [ "../..:v8_maybe_snapshot" ]
   } else {
     deps += [ "../..:v8" ]
   }
 
   cflags = []
   ldflags = []
 }