Remove unused ScopedTempDir member of SubresourceFilterContentSettingsManagerTest.

BUG=546640
R=csharrison@chromium.org


Change-Id: I8e06696bf0ccc29ab291c43528fc373d2ad18b45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898656
Auto-Submit: Greg Thompson <grt@chromium.org>
Commit-Queue: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712568}

chrome/browser/subresource_filter/subresource_filter_content_settings_manager_unittest.cc

@@ -72,8 +72,6 @@ class SubresourceFilterContentSettingsManagerTest : public testing::Test {
   base::SimpleTestClock* test_clock() { return test_clock_; }
 
  private:
-  base::ScopedTempDir scoped_dir_;
-
   content::BrowserTaskEnvironment task_environment_;
   base::HistogramTester histogram_tester_;
   TestingProfile testing_profile_;