Move ASCIIToWide and ASCIIToUTF16 to utf_string_conversions.h. I've found it

weird that UTF8ToWide is in utf_string_conversions, but ASCIIToWide is in
string_util.h. This should help some dependencies since string_util changes
much more frequently than utf_string_conversions and fewer files will now need
string_utils.

Since this requires a lot of changes, this keeps a forward-declaration in
string_util so I can update the entire project incrementally. This change
updates base and net only.

I removed some includes of string_util from header files in net. In particular,
url_request_context which involved creating a new .cc file to implement a
function (already virtual so there's no speed penalty). It turns out a lot of
files were getting string_util from this include, so I had to update a bunch of
random files to now explicitly include string_util.h

TEST=it compiles
BUG=none
Review URL: http://codereview.chromium.org/3076013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@54456 0039d316-1c4b-4281-b951-d872f2087c98

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