Clean up bigram settings

Move bigram suggestion option to the advanced settings screen,
remove bigram prediction option for ICS release and remove the
now-empty bigram option category.

Bug: 5240082
Change-Id: Ib1fc608ad33d5598410f7b0cb4a1639bffef28c7
diff --git a/java/res/xml/prefs.xml b/java/res/xml/prefs.xml
index 6d2218d..2f32181 100644
--- a/java/res/xml/prefs.xml
+++ b/java/res/xml/prefs.xml
@@ -91,23 +91,6 @@
             android:defaultValue="@string/prefs_suggestion_visibility_default_value" />
     </PreferenceCategory>
     <PreferenceCategory
-        android:title="@string/ngram_category"
-        android:key="ngram_settings">
-        <CheckBoxPreference
-            android:key="bigram_suggestion"
-            android:title="@string/bigram_suggestion"
-            android:summary="@string/bigram_suggestion_summary"
-            android:persistent="true"
-            android:defaultValue="true" />
-        <CheckBoxPreference
-            android:key="bigram_prediction"
-            android:dependency="bigram_suggestion"
-            android:title="@string/bigram_prediction"
-            android:summary="@string/bigram_prediction_summary"
-            android:persistent="true"
-            android:defaultValue="false" />
-    </PreferenceCategory>
-    <PreferenceCategory
         android:title="@string/misc_category"
         android:key="misc_settings">
       <CheckBoxPreference
@@ -143,6 +126,20 @@
              android:summary="@string/use_contacts_dict_summary"
              android:persistent="true"
              android:defaultValue="true" />
+          <CheckBoxPreference
+             android:key="bigram_suggestion"
+             android:title="@string/bigram_suggestion"
+             android:summary="@string/bigram_suggestion_summary"
+             android:persistent="true"
+             android:defaultValue="true" />
+          <!-- TODO: evaluate results and revive this option. The code already supports it. -->
+          <!-- <CheckBoxPreference -->
+          <!--    android:key="bigram_prediction" -->
+          <!--    android:dependency="bigram_suggestion" -->
+          <!--    android:title="@string/bigram_prediction" -->
+          <!--    android:summary="@string/bigram_prediction_summary" -->
+          <!--    android:persistent="true" -->
+          <!--    android:defaultValue="false" /> -->
     </PreferenceScreen>
     <!-- <Preference
         android:title="Debug Settings"
diff --git a/java/src/com/android/inputmethod/latin/Settings.java b/java/src/com/android/inputmethod/latin/Settings.java
index a5eed90..b79c441 100644
--- a/java/src/com/android/inputmethod/latin/Settings.java
+++ b/java/src/com/android/inputmethod/latin/Settings.java
@@ -73,7 +73,6 @@
     public static final String PREF_AUTO_CORRECTION_THRESHOLD = "auto_correction_threshold";
     public static final String PREF_DEBUG_SETTINGS = "debug_settings";
 
-    public static final String PREF_NGRAM_SETTINGS_KEY = "ngram_settings";
     public static final String PREF_BIGRAM_SUGGESTIONS = "bigram_suggestion";
     public static final String PREF_BIGRAM_PREDICTIONS = "bigram_prediction";