Revert "Add FontCollection.h to gni"

This reverts commit 9e1e8caff331e6c68d321250fa6a4c7f59df5cd2.

Reason for revert: ooops it was in includes

Original change's description:
> Add FontCollection.h to gni
> 
> Change-Id: I0e720d6cf023303328fd68ce70e09a81e61088f2
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/219697
> Commit-Queue: Herb Derby <herb@google.com>
> Reviewed-by: Herb Derby <herb@google.com>

TBR=herb@google.com,jlavrova@google.com

Change-Id: I4c2c08765ed3502323af028fe0aeb57472db7de0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/219756
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Herb Derby <herb@google.com>
diff --git a/modules/skparagraph/skparagraph.gni b/modules/skparagraph/skparagraph.gni
index e64dc0c..896df6b 100644
--- a/modules/skparagraph/skparagraph.gni
+++ b/modules/skparagraph/skparagraph.gni
@@ -15,7 +15,6 @@
 ]
 
 skparagraph_sources = [
-  "$_src/FontCollection.h",
   "$_src/FontCollection.cpp",
   "$_src/FontIterator.h",
   "$_src/FontIterator.cpp",