Revert "Split out coretext fontmgr factory."

This reverts commit 2c628340f465e063ac2fc338c6edfdd943919cde.

Reason for revert: ios-simulator chrome bot:

FAILED: obj/skia/x64/skia_unittests 
TOOL_VERSION=1591394828 ../../build/toolchain/mac/linker_driver.py -Wcrl,strippath,/opt/s/w/ir/cache/xcode_ios_11e146.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/strip ../../third_party/llvm-build/Release+Asserts/bin/clang++ -B /opt/s/w/ir/cache/xcode_ios_11e146.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/  -Xlinker -rpath -Xlinker @executable_path/Frameworks -Xlinker -objc_abi_version -Xlinker 2 -Xlinker -sectcreate -Xlinker __TEXT -Xlinker __entitlements -Xlinker obj/skia/skia_unittests.xcent -Wl,-fatal_warnings -arch x86_64 -Werror -nostdlib++ -isysroot sdk/xcode_links/iPhoneSimulator13.4.sdk -mios-simulator-version-min=12.0 -Wl,-ObjC -o "obj/skia/x64/skia_unittests" -Wl,-filelist,"obj/skia/x64/skia_unittests.rsp" -framework UIKit  -framework CoreFoundation -framework CoreGraphics -framework CoreText -framework Foundation -framework ImageIO -framework UIKit -framework Security
Undefined symbols for architecture x86_64:
  "SkCTFontGetSmoothBehavior()", referenced from:
      SkTypeface_Mac::onFilterRec(SkScalerContextRec*) const in libskia.a(SkFontHost_mac.o)
      SkScalerContext_Mac::generateImage(SkGlyph const&) in libskia.a(SkFontHost_mac.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)


Original change's description:
> Split out coretext fontmgr factory.
> 
> There can be only one SkFontMgr::Factory, so each should go in its own
> translation unit. In addition, the name SkFontHost_mac is now rather out
> of date and should now be SkFontMgr_mac_ct. Since the additional burden
> of additional build changes after the first is minimal, also split out
> SkTypeface_mac_ct and SkScalerContext_mac_ct. The original
> SkFontHost_mac.cpp is kept as a shell which #includes the cpp files
> which are replacing it. Once references to it are removed from all
> builds it can be removed.
> 
> This is intended to be a reorganization without much code change. Most
> changes are simple renaming of functions which are now shared between
> translation units. However, there are a few behavior changes here.
>   * Drop SkTypefaceCache global for SkTypeface_Mac 'local' global.
>   * SkCTFontCTWidthForCSSWidth returns CGFloat instead of 'int'.
>   * SkFontMgr_New_CoreText takes a CTFontCollectionRef.
> 
> Change-Id: I897f69f2f5ea06819f5daa964c09cdd36490af85
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/294456
> Reviewed-by: Mike Klein <mtklein@google.com>
> Commit-Queue: Ben Wagner <bungeman@google.com>
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/294704

TBR=mtklein@google.com,bungeman@google.com

Change-Id: I5abeb7598c7f533477b4a4af5b568f7cbe6e8644
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/294734
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
15 files changed