install-build-deps-android: remove python-pexpect

Debian has removed python-pexpect:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=937275

//third_party/pexpect is preferred.

Change-Id: I0e3355ce2fdd90860592de908f14e734d9c28d34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585263
Commit-Queue: Johann Koenig <johannkoenig@google.com>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Johann Koenig <johannkoenig@google.com>
Cr-Commit-Position: refs/heads/master@{#836948}

build/install-build-deps-android.sh

@@ -28,7 +28,7 @@ lsb_release=$(lsb_release --codename --short)
 sudo apt-get -f install
 
 # common
-sudo apt-get -y install lib32z1 lighttpd python-pexpect xvfb x11-utils
+sudo apt-get -y install lib32z1 lighttpd xvfb x11-utils
 
 # Some binaries in the Android SDK require 32-bit libraries on the host.
 # See https://developer.android.com/sdk/installing/index.html?pkg=tools