Changes error messaging in devmode.js.

This change makes sure we show the glass pane in dev mode even the error
function is set via gwt:onLoadErrorFn.

If developer has not whitelisted host url, then GWTTestCase will fail when
executed in manual mode using dev mode. However in Chrome it is not clear
why the test case fails. Only message is:
Failed to load module 'blah'. Please see log for details.

Of course there is no nothing in the logs and dev mode doesn't show the error in
glass pane as it would normally do because gwt:onLoadErrorFn is set in junit.html.

It is not an easy to fix it on junit side as the cause is not communicated back
to error handling function and I don't want to change the contract.

Change-Id: Iee4d0540d843b27623c7b6b9d3702df060a0acbf
Review-Link: https://gwt-review.googlesource.com/#/c/2481/

Review by: skybrian@google.com
By default, disable Super Dev Mode on https pages.
This should make it safer to leave the Super Dev Mode hook on all the time
when the production server uses https.

New API: CrossSiteIframeLinker.getJsDevModeRedirectHookPermitted() can be
overridden to change the JavaScript expression that does the check.

See issue 7538.

Change-Id: Ic603c9e511a766cd4c89b15f7561a254070c6ac5
Review-Link: https://gwt-review.googlesource.com/#/c/2480/

Review by: mdempsky@google.com
add StringBuffer/Builder.reverse

fixes ISSUE 449

Change-Id: I342e7ed86c0e4efa90d09bdfe0d72c79db2654c5
Review-Link: https://gwt-review.googlesource.com/#/c/2431/

Review by: goktug@google.com
Widget Iterator now throws NoSuchElementExceptions correctly.

Change-Id: I07fd1507226a185b94ae1e85b6eb0235ec370a9f
Review-Link: https://gwt-review.googlesource.com/#/c/2440/

Review by: goktug@google.com
Upon selection in a SuggestBox's pop up, focus the text field

After selecting a value from a SuggestBox's suggestion list, the
suggestion list closes and focus snaps back to the body
element. However, users expect the focus to be in the corresponding
ValueBox. So upon the user selecting a value, we set the focus to the
ValueBox per default.

Fixes issue 8051.

Change-Id: I08ba1abf8432ef4ad65c0a6b57983067d66b0d9f
Review-Link: https://gwt-review.googlesource.com/#/c/2100/

Review by: goktug@google.com