Convert evict callback from function to interface

This allows me to find uses of the eviction registratoin
easier in my IDE.

Change-Id: I127911f769d90716f6c8bb69d71b2255786aec21
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/265981
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Herb Derby <herb@google.com>
diff --git a/src/gpu/text/GrAtlasManager.cpp b/src/gpu/text/GrAtlasManager.cpp
index a4efc51..26dad6b 100644
--- a/src/gpu/text/GrAtlasManager.cpp
+++ b/src/gpu/text/GrAtlasManager.cpp
@@ -161,7 +161,7 @@
                 fProxyProvider, format, grColorType,
                 atlasDimensions.width(), atlasDimensions.height(),
                 plotDimensions.width(), plotDimensions.height(),
-                fAllowMultitexturing, &GrStrikeCache::HandleEviction, fGlyphCache);
+                fAllowMultitexturing, fGlyphCache);
         if (!fAtlases[index]) {
             return false;
         }