Refactor BrowserFont to new design

TEST=browser_tests,ppapi/example/font
BUG=

Review URL: https://chromiumcodereview.appspot.com/11316161

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@169611 0039d316-1c4b-4281-b951-d872f2087c98

• content/renderer/pepper/pepper_in_process_resource_creation.cc[diff]
• content/renderer/pepper/pepper_in_process_resource_creation.h[diff]
• ppapi/ppapi_internal.gyp[diff]
• ppapi/ppapi_proxy.gypi[diff]
• ppapi/ppapi_shared.gypi[diff]
• ppapi/proxy/browser_font_resource_trusted.cc[Renamed from ppapi/shared_impl/private/ppb_browser_font_trusted_shared.cc - diff]
• ppapi/proxy/browser_font_resource_trusted.h[Renamed from ppapi/shared_impl/private/ppb_browser_font_trusted_shared.h - diff]
• ppapi/proxy/resource_creation_proxy.cc[diff]
• webkit/plugins/ppapi/resource_creation_impl.cc[diff]
• webkit/plugins/ppapi/resource_creation_impl.h[diff]