Bug 941489 - [B2G][Helix][Browser][ChenHoulai] The inputmethod can not be pop after press home button in the 'Clear browsing history' dialog surface of browser

cherry picked from commit 2eb14d5de28b5f12ddcc50ffc4e0b74932bd4192
(Bug 814436 - Ensure clear data dialogs have warning UI)

Conflicts:
	apps/browser/js/browser.js