Replace 'typedef xxxxx INHERITED' with 'using INHERITED = xxxx;'.

Mechanically updated via Xcode "Replace Regular Expression":

  typedef (.*) INHERITED;
    -->
  using INHERITED = $1;

The ClangTidy approach generated an even larger CL which would have
required a significant amount of hand-tweaking to be usable.

Change-Id: I671dc9d9efdf6d60151325c8d4d13fad7e10a15b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/314999
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
diff --git a/gm/sample_matrix_variable.cpp b/gm/sample_matrix_variable.cpp
index 9f2ab18..4932460 100644
--- a/gm/sample_matrix_variable.cpp
+++ b/gm/sample_matrix_variable.cpp
@@ -44,7 +44,7 @@
     float fXOffset;
     float fYOffset;
 
-    typedef GrFragmentProcessor INHERITED;
+    using INHERITED = GrFragmentProcessor;
     friend class GLSLSampleMatrixVariableEffect;
 };