Remove mention of emulator from BUILDING.md
diff --git a/doc/BUILDING.md b/doc/BUILDING.md
index 38bb756..3bbac7b 100644
--- a/doc/BUILDING.md
+++ b/doc/BUILDING.md
@@ -105,8 +105,7 @@
 
     ./gradlew -Plpreview installLpreviewDebug
 
-You will need a device flashed with the Android L preview system image, or
-you can use the emulator.
+You will need a device flashed with the Android L preview system image.
 
 # Server-side setup