Convert infobar APIs to UTF-16.

Convert infobar APIs to UTF-16.

The critical change is the base class in infobar_delegate.h.
The remainder is just adapting all users to that change.

I grepped for all instances of the three base functions whose
types I changed to be more sure that I found all classes that
tried to overload these functions.  I sure wish C++ had an
@Override annotation.  :~(

TEST=compiles
BUG=23581
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=56066

[viettrungluu, 2010-08-13 19:22:03]

LGTM with tiny style nits.

http://codereview.chromium.org/3127009/diff/2001/3019
File chrome/browser/extensions/extension_install_ui.cc (right):

http://codereview.chromium.org/3127009/diff/2001/3019#newcode355
chrome/browser/extensions/extension_install_ui.cc:355:
l10n_util::GetStringFUTF16(IDS_EXTENSION_INSTALLED_HEADING,
Indent 2 more spaces (and below too, to align).

http://codereview.chromium.org/3127009/diff/2001/3035
File chrome/browser/tab_contents/tab_contents_ssl_helper.cc (right):

http://codereview.chromium.org/3127009/diff/2001/3035#newcode117
chrome/browser/tab_contents/tab_contents_ssl_helper.cc:117: void
ShowErrorInfoBar(const std::wstring& message) {
We'll leave converting this to another day. ;)

http://codereview.chromium.org/3127009/diff/2001/3035#newcode119
chrome/browser/tab_contents/tab_contents_ssl_helper.cc:119: new
SimpleAlertInfoBarDelegate(tab_, WideToUTF16(message), GetCertIcon(),
80 cols