Fix RadioButtonGroupHomepagePreference to gain focus

Starting the HomepageSettings, the RadioButtonGroupHomepagePreference
will gain focus automatically and have a highlight background on it.
This CL disables the focusableInTouchMode attribute in the xml.

Bug: 1052498
Change-Id: If89f92fca8195bd4289648511356a2264a55bbcf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2060657
Commit-Queue: Wenyu Fu <wenyufu@chromium.org>
Commit-Queue: Theresa  <twellington@chromium.org>
Auto-Submit: Wenyu Fu <wenyufu@chromium.org>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744332}

chrome/android/java/res/layout/radio_button_group_homepage_preference.xml

@@ -8,8 +8,6 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    android:focusable="true"
-    android:focusableInTouchMode="true"
     android:orientation="vertical">
 
   <!-- TODO(crbug.com/1048859): Change to the exact style TextMessagePreference is using. -->
@@ -27,7 +25,8 @@
   <org.chromium.components.browser_ui.widget.RadioButtonWithDescriptionLayout
       android:id="@+id/radio_button_group"
       android:layout_width="match_parent"
-      android:layout_height="wrap_content">
+      android:layout_height="wrap_content"
+      android:focusableInTouchMode="true">
 
     <!-- TODO(crbug.com/1048863): Remove android:background for radio buttons here and below after enhancement. -->
     <org.chromium.components.browser_ui.widget.RadioButtonWithDescription

chrome/android/java/res/xml/homepage_preferences.xml

@@ -21,6 +21,7 @@
     <org.chromium.chrome.browser.settings.homepage.RadioButtonGroupHomepagePreference
         android:key="homepage_radio_group"
         android:visibility="gone"
+        android:selectable="false"
         app:allowDividerBelow="false" />
 
     <org.chromium.chrome.browser.settings.TextMessagePreference