[Password manager Python tests] Remove some dead code

components/test/data/password_manager/automated_tests/README

 This file contains high-level info about how to use password manager tests and 
 how to create new ones.
 
 The password manager tests purpose is to allow automatic password manager 
 checking and avoiding to do so manually.
 The tests are written in python using selenium Webdriver library.
 
 
 =====Getting started=====
 
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 * Click: find an element using CSS Selector and click on it. Throw an 
 exception if the element is not visible.
 self.Click("css_selector")
 * ClickIfClickable: find an element using CSS Selector and click on it if it's
 possible to do that.
 self.ClickIfClickable("css_selector")
 * GoTo: navigate the main frame to a url.
 self.GoTo("url")
 * HoverOver: find an element using CSS Selector and hover over it.
 self.HoverOver("css_selector")
-* SendEnterTo: find an element using CSS Selector and send enter to it.
-self.SendEnterTo("css_selector")
 
 * IsDisplayed: check if an element is displayed.
 self.IsDisplayed("css_selector")
 * Wait: wait for some amount of time in seconds.
 self.Wait(10)
 * WaitUntilDisplayed: wait for an element defined using CSS Selector to be 
 displayed.
 self.WaitUntilDisplayed("css_selector")
 
 * FillPasswordInto: find an input element using CSS Selector and fill it with
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 * Remove the profile if the tests fail at the beginning for unknown reason.
 * If tests fail, isolate the one that causes problem, read debugging messages
 and keep your eyes on the browser window to understand its causes:
 a) In the tests, we often need to wait for a menu to appear ... If the 
 menu takes more time to appear than expected, the tests are going to fail.
 b) The websites change very often. And even if they are not changed, they some 
 time show a popup that broke the tests. In the case you need to login manually 
 to the website, close all popup and logout.
 * If you are logged in when the tests crashes, don't forget to log out before
 running the tests a second time.