When we close a window on exit, make sure pauseWebView taking action by
setting mPageStarted to false.

Part 1 for fixing http://b/issue?id=2087410
diff --git a/src/com/android/browser/BrowserActivity.java b/src/com/android/browser/BrowserActivity.java
index 5a27554..3553193 100644
--- a/src/com/android/browser/BrowserActivity.java
+++ b/src/com/android/browser/BrowserActivity.java
@@ -1985,6 +1985,10 @@
                 closeTab(current);
             } else {
                 if (current.closeOnExit()) {
+                    // force mPageStarted to be false as we are going to either
+                    // finish the activity or remove the tab. This will ensure
+                    // pauseWebView() taking action.
+                    mPageStarted = false;
                     if (mTabControl.getTabCount() == 1) {
                         finish();
                         return;