"Chromium Autofill Settings" option should open autofill settings page.

Added code to open autofill settings page.

If "Chromium Autofill Settings" option" is selected from autofill menu
autofill forms settings page should be opened.

Please enter the commit message for your changes. Lines starting

BUG=454779

Review URL: https://codereview.chromium.org/896653007

Cr-Commit-Position: refs/heads/master@{#314716}

chrome/android/java/src/org/chromium/chrome/browser/ChromiumApplication.java

@@ -4,8 +4,14 @@
 
 package org.chromium.chrome.browser;
 
+import android.os.Build;
+
 import org.chromium.base.CalledByNative;
 import org.chromium.chrome.browser.preferences.LocationSettings;
+import org.chromium.chrome.browser.preferences.PreferencesLauncher;
+import org.chromium.chrome.browser.preferences.ProtectedContentPreferences;
+import org.chromium.chrome.browser.preferences.autofill.AutofillPreferences;
+import org.chromium.chrome.browser.preferences.password.ManageSavedPasswordsPreferences;
 import org.chromium.content.app.ContentApplication;
 
 /**
@@ -23,13 +29,23 @@ public abstract class ChromiumApplication extends ContentApplication {
      * Opens a protected content settings page, if available.
      */
     @CalledByNative
-    protected void openProtectedContentSettings() {}
+    protected void openProtectedContentSettings() {
+        assert Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
+        PreferencesLauncher.launchSettingsPage(this,
+                ProtectedContentPreferences.class.getName());
+    }
 
     @CalledByNative
-    protected void showAutofillSettings() {}
+    protected void showAutofillSettings() {
+        PreferencesLauncher.launchSettingsPage(this,
+                AutofillPreferences.class.getName());
+    }
 
     @CalledByNative
-    protected void showPasswordSettings() {}
+    protected void showPasswordSettings() {
+        PreferencesLauncher.launchSettingsPage(this,
+                ManageSavedPasswordsPreferences.class.getName());
+    }
 
     /**
      * Returns an instance of LocationSettings to be installed as a singleton.