[Sync] Cleanup all tab sync enabling logic now that its on by default.

BUG=none
TEST=


Review URL: https://chromiumcodereview.appspot.com/10443046

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@139462 0039d316-1c4b-4281-b951-d872f2087c98
 void SyncTest::TriggerCreateSyncedBookmarks() {
   ASSERT_TRUE(ServerSupportsErrorTriggering());
   std::string path = "chromiumsync/createsyncedbookmarks";
  ui_test_utils::NavigateToURL(browser(), sync_server_.GetURL(path));
  ASSERT_EQ("Synced Bookmarks",
            UTF16ToASCII(browser()->GetSelectedWebContents()->GetTitle()));
}

 void SyncTest::TriggerCreateSyncedBookmarks() {
   ASSERT_TRUE(ServerSupportsErrorTriggering());
   std::string path = "chromiumsync/createsyncedbookmarks";
  ui_test_utils::NavigateToURL(browser(), sync_server_.GetURL(path));
  ASSERT_EQ("Synced Bookmarks",
            UTF16ToASCII(browser()->GetSelectedWebContents()->GetTitle()));
}
