Eliminate unused function.

This was blocking the Android roll: http://screen/9937JW7waCFer64

Change-Id: I89a88ff5a28e077fb302b5c803d0e4829de35103
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/504416
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
diff --git a/tests/SkSLTest.cpp b/tests/SkSLTest.cpp
index ca468f5..9113aee 100644
--- a/tests/SkSLTest.cpp
+++ b/tests/SkSLTest.cpp
@@ -211,15 +211,6 @@
     SkSL::dsl::End();
 }
 
-static int write_symbol_tables(SkSL::Dehydrator& dehydrator, const SkSL::SymbolTable& s) {
-    int count = 1;
-    if (s.fParent) {
-        count += write_symbol_tables(dehydrator, *s.fParent);
-    }
-    dehydrator.write(s);
-    return count;
-}
-
 static void test_rehydrate(skiatest::Reporter* r, const char* testFile) {
     SkString shaderString = load_source(r, testFile, "");
     if (shaderString.isEmpty()) {