Separate plugin_metadata from plugin_installer, thread-safe plugin_finder

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index 8b9e3b32e7f2797c4c9d0ad1baabad9cea7aa7b6..2bd030b3bb0f8d430659d681697b9f116ea64dc5 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -1438,7 +1438,7 @@
         'browser/password_manager/password_store_x_unittest.cc',
         'browser/performance_monitor/database_unittest.cc',
         'browser/plugins/plugin_finder_unittest.cc',
-        'browser/plugins/plugin_installer_unittest.cc',
+        'browser/plugins/plugin_metadata_unittest.cc',
         'browser/plugins/plugin_prefs_unittest.cc',
         'browser/policy/async_policy_provider_unittest.cc',
         'browser/policy/auto_enrollment_client_unittest.cc',
@@ -2574,8 +2574,6 @@
         }],
         ['enable_plugin_installation==0', {
           'sources!': [
-            'browser/plugins/plugin_finder_unittest.cc',
-            'browser/plugins/plugin_installer_unittest.cc',
           ],
         }],
         ['enable_protector_service==0', {