Fix browser window shelf id init; re-enable browser test.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
index b204f527360cdb85f1c5da6618ccd1e8739f82e4..8f7d0e4d825b0076c9afb4101d06a3f0d3b4306e 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl_browsertest.cc
@@ -2151,9 +2151,7 @@ IN_PROC_BROWSER_TEST_F(ShelfAppBrowserTestNoDefaultBrowser,
 }
 
 // Check that the window's ShelfID property matches that of the active tab.
-// TODO(https://crbug.com/694941): Disabled due to flakiness.
-IN_PROC_BROWSER_TEST_F(ShelfAppBrowserTest,
-                       DISABLED_MatchingShelfIDandActiveTab) {
+IN_PROC_BROWSER_TEST_F(ShelfAppBrowserTest, MatchingShelfIDandActiveTab) {
   EXPECT_EQ(1u, chrome::GetTotalBrowserCount());
   EXPECT_EQ(1, browser()->tab_strip_model()->count());
   EXPECT_EQ(0, browser()->tab_strip_model()->active_index());