[Android] Refactor: move files to chrome/browser/notifications/channels

chrome/android/java_sources.gni

Index: chrome/android/java_sources.gni
diff --git a/chrome/android/java_sources.gni b/chrome/android/java_sources.gni
index 918e0ef552c3f3af7ed42f7374f34b8d1fcba83e..a9deeb4e1b8220627f5c92cf53e626e8e7f497f1 100644
--- a/chrome/android/java_sources.gni
+++ b/chrome/android/java_sources.gni
@@ -574,9 +574,6 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/nfc/BeamController.java",
   "java/src/org/chromium/chrome/browser/nfc/BeamProvider.java",
   "java/src/org/chromium/chrome/browser/notifications/ActionInfo.java",
-  "java/src/org/chromium/chrome/browser/notifications/ChannelDefinitions.java",
-  "java/src/org/chromium/chrome/browser/notifications/ChannelsInitializer.java",
-  "java/src/org/chromium/chrome/browser/notifications/ChannelsUpdater.java",
   "java/src/org/chromium/chrome/browser/notifications/ChromeNotificationBuilder.java",
   "java/src/org/chromium/chrome/browser/notifications/CustomNotificationBuilder.java",
   "java/src/org/chromium/chrome/browser/notifications/NotificationBuilder.java",
@@ -594,6 +591,9 @@ chrome_java_sources = [
   "java/src/org/chromium/chrome/browser/notifications/NotificationUmaTracker.java",
   "java/src/org/chromium/chrome/browser/notifications/StandardNotificationBuilder.java",
   "java/src/org/chromium/chrome/browser/notifications/WebApkNotificationClient.java",
+  "java/src/org/chromium/chrome/browser/notifications/channels/ChannelDefinitions.java",
+  "java/src/org/chromium/chrome/browser/notifications/channels/ChannelsInitializer.java",
+  "java/src/org/chromium/chrome/browser/notifications/channels/ChannelsUpdater.java",
   "java/src/org/chromium/chrome/browser/ntp/ChromeHomeIncognitoNewTabPage.java",
   "java/src/org/chromium/chrome/browser/ntp/ChromeHomeNewTabPage.java",
   "java/src/org/chromium/chrome/browser/ntp/ChromeHomeNewTabPageBase.java",
@@ -1695,10 +1695,10 @@ chrome_junit_test_java_sources = [
   "junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationTestTabHolder.java",
   "junit/src/org/chromium/chrome/browser/media/ui/MediaNotificationTitleUpdatedTest.java",
   "junit/src/org/chromium/chrome/browser/metrics/VariationsSessionTest.java",
-  "junit/src/org/chromium/chrome/browser/notifications/ChannelDefinitionsTest.java",
-  "junit/src/org/chromium/chrome/browser/notifications/ChannelsInitializerTest.java",
-  "junit/src/org/chromium/chrome/browser/notifications/ChannelsUpdaterTest.java",
   "junit/src/org/chromium/chrome/browser/notifications/NotificationPlatformBridgeUnitTest.java",
+  "junit/src/org/chromium/chrome/browser/notifications/channels/ChannelDefinitionsTest.java",
+  "junit/src/org/chromium/chrome/browser/notifications/channels/ChannelsInitializerTest.java",
+  "junit/src/org/chromium/chrome/browser/notifications/channels/ChannelsUpdaterTest.java",
   "junit/src/org/chromium/chrome/browser/ntp/NativePageFactoryTest.java",
   "junit/src/org/chromium/chrome/browser/ntp/TitleUtilTest.java",
   "junit/src/org/chromium/chrome/browser/ntp/cards/ContentSuggestionsUnitTestUtils.java",