[Chromium] Out-of-process font loading garbles text

[Chromium] Out-of-process font loading garbles text
https://bugs.webkit.org/show_bug.cgi?id=83002

Reviewed by Kent Tamura.

Initialize m_CTFont by using m_cgFont in FontPlatformData when we use
out-of-process font loading.

No new tests. This problem only occurs when the user uses a third party
font management software like Font Explorer so it is difficult to add
tests.

* platform/graphics/chromium/CrossProcessFontLoading.mm:
(WebCore):
(WebCore::FontPlatformData::loadFont): If font loading fails, set null to outNSFont so that the FontPlatformData won't be used.
* platform/graphics/cocoa/FontPlatformDataCocoa.mm:
(WebCore::FontPlatformData::ctFont): Modified to return the appropriate NSFont object when the font from the browser process.
* platform/graphics/mac/FontCacheMac.mm:
(WebCore::FontCache::createFontPlatformData): Returns null when the generated FontPlatformData object doesn't have NSFont object.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113132 268f45cc-cd09-0410-ab3c-d52691b4dbfc