Use framework scheme definitions

Use PhoneAccount defined values for SCHEME_{TEL, SIP, VOICEMAIL}.

Bug:17398074
Change-Id: I36adb16f659daef89957072f9e00d08ea2cb8e9e
diff --git a/src/com/android/phone/OutgoingCallBroadcaster.java b/src/com/android/phone/OutgoingCallBroadcaster.java
index 6d8830e..0f47c12 100644
--- a/src/com/android/phone/OutgoingCallBroadcaster.java
+++ b/src/com/android/phone/OutgoingCallBroadcaster.java
@@ -35,6 +35,7 @@
 import android.os.RemoteException;
 import android.os.SystemProperties;
 import android.os.UserHandle;
+import android.telecomm.PhoneAccount;
 import android.telephony.PhoneNumberUtils;
 import android.text.TextUtils;
 import android.util.Log;
@@ -607,7 +608,7 @@
         // a plain address, whether it could be a tel: URI, etc.)
         Uri uri = intent.getData();
         String scheme = uri.getScheme();
-        if (Constants.SCHEME_SIP.equals(scheme) || PhoneNumberUtils.isUriNumber(number)) {
+        if (PhoneAccount.SCHEME_SIP.equals(scheme) || PhoneNumberUtils.isUriNumber(number)) {
             Log.i(TAG, "The requested number was detected as SIP call.");
             startSipCallOptionHandler(this, intent, uri, number);
             finish();