Remove multi-tap feature

Change-Id: Ife44b3f9d420d77d2cfb51044a8356f02ed63e8b
diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 549c2ae..9759e0e 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -94,8 +94,8 @@
     </declare-styleable>
 
     <declare-styleable name="Keyboard_Key">
-        <!-- The unicode value or comma-separated values that this key outputs. -->
-        <attr name="codes" format="integer|string" />
+        <!-- The unicode value that this key outputs. -->
+        <attr name="code" format="integer" />
         <!-- The characters to display in the popup keyboard. -->
         <attr name="popupCharacters" format="string" />
         <!-- Maximum column of popup keyboard -->
diff --git a/java/res/values/config.xml b/java/res/values/config.xml
index 4187c31..1225304 100644
--- a/java/res/values/config.xml
+++ b/java/res/values/config.xml
@@ -41,7 +41,6 @@
     <integer name="config_keyboard_grid_height">16</integer>
     <integer name="config_long_press_key_timeout">400</integer>
     <integer name="config_long_press_shift_key_timeout">1200</integer>
-    <integer name="config_multi_tap_key_timeout">800</integer>
     <string name="config_text_size_of_language_on_spacebar">small</string>
     <integer name="config_max_popup_keyboard_column">9</integer>
     <!-- Whether or not auto-correction should be enabled by default -->