Move c/c/e/extension_set to top-level extensions/

Move extension_set.h/cc and extension_set_unittest to extensions/common/.
Remove unused includes.
Add includes where transitive includes were used.
Update DEPS.
No functional changes.

BUG=162530
[email protected] (c/b/autocomplete, c/b/ui, c/test)
[email protected] (c/b/automation)
[email protected] (c/b/background, c/b/sync, c/b/policy)
[email protected] (c/b/browsing_data, c/b/content_settings, c/b/managed_mode)
[email protected] (c/b/chromeos)
[email protected] (c/b/devtools)
[email protected] (c/b/media_galleries)
[email protected] (c/b/notifications)
[email protected] (c/b/profile_resetter)
[email protected] (c/b/speech)
[email protected] (c/b/sync_file_system)
[email protected] (c/b/themes)

Review URL: https://codereview.chromium.org/102103005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241131 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/extensions/component_loader_unittest.cc b/chrome/browser/extensions/component_loader_unittest.cc
index 64f67d8..ad0624b 100644
--- a/chrome/browser/extensions/component_loader_unittest.cc
+++ b/chrome/browser/extensions/component_loader_unittest.cc
@@ -11,12 +11,12 @@
 #include "base/prefs/pref_registry_simple.h"
 #include "chrome/browser/extensions/test_extension_service.h"
 #include "chrome/common/chrome_paths.h"
-#include "chrome/common/extensions/extension_set.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/testing_pref_service_syncable.h"
 #include "components/user_prefs/pref_registry_syncable.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
+#include "extensions/common/extension_set.h"
 #include "extensions/common/manifest_handlers/background_info.h"
 #include "testing/gtest/include/gtest/gtest.h"