Remove GrPixelConfigIsCompressed call.

Bug: skia:6718
Change-Id: Ia6363d74f016b076fa5e19a57d223f7c47b723c0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/248999
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/src/gpu/GrProxyProvider.cpp b/src/gpu/GrProxyProvider.cpp
index 2c7153a..6abdc24 100644
--- a/src/gpu/GrProxyProvider.cpp
+++ b/src/gpu/GrProxyProvider.cpp
@@ -507,7 +507,7 @@
                         width, height, format, compressionType, budgeted, data.get()));
             },
             format, desc, GrRenderable::kNo, 1, kTopLeft_GrSurfaceOrigin, GrMipMapped::kNo,
-            GrMipMapsStatus::kNotAllocated, GrInternalSurfaceFlags::kNone, SkBackingFit::kExact,
+            GrMipMapsStatus::kNotAllocated, GrInternalSurfaceFlags::kReadOnly, SkBackingFit::kExact,
             SkBudgeted::kYes, GrProtected::kNo, UseAllocator::kYes);
 
     if (!proxy) {