Use v2 web-app for Chromoting Windows browser-tests.

BUG=447778

Review URL: https://codereview.chromium.org/973983003

Cr-Commit-Position: refs/heads/master@{#319004}

testing/chromoting/chromoting_integration_tests.isolate

@@ -101,7 +101,7 @@
           '--gtest_filter=RemoteDesktopBrowserTest.MANUAL_Launch:RemoteDesktopBrowserTest.MANUAL_Auth',
           '--run-manual',
           '--ui-test-action-timeout=100000',
-          '--webapp-unpacked=<(PRODUCT_DIR)/remoting/remoting.webapp',
+          '--webapp-unpacked=<(PRODUCT_DIR)/remoting/remoting.webapp.v2',
           '--extension-name=Chromoting',
           '--accounts-file=../../remoting/tools/internal/test_accounts.json',
           '--account-type=gmail',