Move Android intent payment app launcher to //chrome.

Before this patch, the AndroidPaymentApp.LauncherImpl class used
WindowAndroid.showIntent() to launch the "PAY" intent, but
WindowAndroid.showIntent() in WebView does not receive data back from
the launched app.

This patch moves the AndroidPaymentApp.Launcher interface to
AndroidIntentLauncher.java file and AndroidPaymentApp.LauncherImpl class
to WindowAndroidIntentLauncher.java file in //chrome directory.

After this patch, WebView and other embedders can provide their own
implementations for launching payment intents that receive back data
from the launched payment app.

Fixed: 395103830
Change-Id: Ie047005dfe57d6b10f3e7ad2122fec777d1370b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6253062
Commit-Queue: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Slobodan Pejic <slobodan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1419269}