Fix leaks in class CFGAS_FontMgrImp
Fix leaks in class CFGAS_FontMgrImp

Two leak cases are addressed here:
--In CFGAS_FontMgrImp::LoadFont(), calling LoadFace() is unnecessary
since the following LoadFile() does the exact same thing. Calling
LoadFace() without releasing the loaded face results in a leak;
--|m_Hash2Fonts| in class CFGAS_FontMgrImp owns all the fonts stored
in it. The fonts need to be deleted along with the container.

BUG=pdfium:242

Review-Url: https://codereview.chromium.org/2322483003

DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium,DrAlexx/pdfium