Fix WTF::copyLCharsFromUCharSource() to compile with -Wshorten-64-to-32
<http://webkit.org/b/107227>

Reviewed by Benjamin Poulain.

Fixes the following build error:

    ASCIIFastPath.h:117:59: error: implicit conversion loses integer precision: 'unsigned long' to 'const unsigned int' [-Werror,-Wshorten-64-to-32]
            const unsigned endLength = length - ucharsPerLoop + 1;
                           ~~~~~~~~~   ~~~~~~~~~~~~~~~~~~~~~~~^~~
    1 error generated.

* wtf/text/ASCIIFastPath.h:
(WTF::copyLCharsFromUCharSource): Change local variables from
unsigned to size_t.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140162 268f45cc-cd09-0410-ab3c-d52691b4dbfc
[EFL] Unreviewed gardening.

Rebaseline after enabling subpixel layout and updating freetype (17/26).

* platform/efl/fast/text/ (Part 2)
* platform/efl/fast/tokenizer/
* platform/efl/fast/transforms/
* platform/efl/fast/writing-mode/
* platform/efl/fast/xsl/
* platform/efl/fonts/
* platform/efl/fullscreen/
* platform/efl/http/
* platform/efl/ietestcenter/
* platform/efl/mathml/
* platform/efl/media/
* platform/efl/plugins/
* platform/efl/printing/
* platform/efl/scrollbars/
* platform/efl/svg/ (Part 1)

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140163 268f45cc-cd09-0410-ab3c-d52691b4dbfc