Fix build dependencies in src/extensions

* lazy_background_task_queue_unittest.cc uses keyed_service/content directly
so make dependency explicit.
* I missed the GN build file when adding extensions_test.h/cc

BUG=none
TEST=compiles

Review URL: https://codereview.chromium.org/432433003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287471 0039d316-1c4b-4281-b951-d872f2087c98

extensions/BUILD.gn

@@ -42,6 +42,8 @@ source_set("test_support") {
     "browser/api/dns/mock_host_resolver_creator.h",
     "browser/api_test_utils.cc",
     "browser/api_test_utils.h",
+    "browser/extensions_test.cc",
+    "browser/extensions_test.h",
     "browser/test_extensions_browser_client.cc",
     "browser/test_extensions_browser_client.h",
     "browser/test_management_policy.cc",

extensions/extensions.gyp

@@ -798,6 +798,7 @@
       'dependencies': [
         '../base/base.gyp:base',
         '../base/base.gyp:test_support_base',
+        '../components/components.gyp:keyed_service_content',
         '../content/content_shell_and_tests.gyp:test_support_content',
         '../device/serial/serial.gyp:device_serial',
         '../mojo/mojo_base.gyp:mojo_environment_chromium',