DO NOT MERGE Bump up AOSP Contacts version to 1.6.8.

bug:31101408
Change-Id: I16cf7df6fc479201b4e2d1942227892f41e8f120
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 008c66f..3506ded 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -16,8 +16,8 @@
 
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.android.contacts"
-    android:versionCode="10607"
-    android:versionName="1.6.7">
+    android:versionCode="10608"
+    android:versionName="1.6.8">
 
     <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="25" />