Upgrade target SDK version to 27.

Test: None
PiperOrigin-RevId: 179458302
Change-Id: Ic6bfd4abe4c7f51d395488863edc1515754f6b36
diff --git a/java/com/android/incallui/AndroidManifest.xml b/java/com/android/incallui/AndroidManifest.xml
index d854a7f..af99700 100644
--- a/java/com/android/incallui/AndroidManifest.xml
+++ b/java/com/android/incallui/AndroidManifest.xml
@@ -19,7 +19,7 @@
 
   <uses-sdk
       android:minSdkVersion="23"
-      android:targetSdkVersion="26"/>
+      android:targetSdkVersion="27"/>
 
   <uses-permission android:name="android.permission.CONTROL_INCALL_EXPERIENCE"/>
   <!-- We use this to disable the status bar buttons of home, back and recent