Make some small fixes to install-android-prebuilt.sh

1) Remove the merge artifacts at the beginning of the line
2) Remove the --passphrase argument, it is not supported in gpg any
   more.

scripts/install-android-prebuilt.sh

@@ -1,4 +1,3 @@
-@@ -0,0 1,85 @@
 #!/bin/bash
 #
 # This script signs already built AOSP Android jars, and installs them in your local
@@ -20,11 +19,6 @@ if [[ $# -ne 3 ]]; then
     exit 1
 fi
 
-read -p "Please set the GPG passphrase: " -s signingPassphrase
-if [[ -z "${signingPassphrase}" ]]; then
-    exit 1
-fi
-
 JAR_DIR=$(readlink -e "$1")
 ANDROID_VERSION="$2"
 ROBOLECTRIC_SUB_VERSION="$3"
@@ -53,7 +47,7 @@ build_signed_packages() {
 
     echo "Robolectric: Signing files with gpg..."
     for ext in ".jar" "-javadoc.jar" "-sources.jar" ".pom"; do
-        ( cd ${JAR_DIR} && gpg -ab --passphrase ${signingPassphrase} android-all-${ROBOLECTRIC_VERSION}$ext )
+        ( cd ${JAR_DIR} && gpg -ab android-all-${ROBOLECTRIC_VERSION}$ext )
     done
 
     echo "Robolectric: Creating bundle for Sonatype upload..."
@@ -90,4 +84,4 @@ generate_empty_javadoc
 build_signed_packages
 mavenize
 
-echo "DONE!!"
+echo "DONE!!"