[inspector] conditionally copy files for inspector test.

test/inspector/inspector.isolate

 # 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.
 {
-  'variables': {
-    'files': [
-      './console/',
-      './cpu-profiler/',
-      './debugger/',
-      './inspector.status',
-      './json-parse-expected.txt',
-      './json-parse.js',
-      './protocol-test.js',
-      './runtime/',
-      './testcfg.py',
-    ],
-  },
   'conditions': [
     ['v8_enable_inspector==1', {
       'variables': {
         'files': [
+          './console/',
+          './cpu-profiler/',
+          './debugger/',
+          './inspector.status',
+          './json-parse-expected.txt',
+          './json-parse.js',
+          './protocol-test.js',
+          './runtime/',
+          './testcfg.py',
           '<(PRODUCT_DIR)/inspector-test<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
   ],
   'includes': [
     '../../src/base.isolate',
     '../../tools/testrunner/testrunner.isolate',
   ],
 }