remove need for command flags cast

TBR=mtklein@google.com
Bug: skia: 6898
Change-Id: I1c83fe67cbfb978f15ebcbb9081ac4d4a8f00e4a
Reviewed-on: https://skia-review.googlesource.com/46680
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Cary Clark <caryclark@skia.org>
Commit-Queue: Cary Clark <caryclark@skia.org>
diff --git a/tools/flags/SkCommandLineFlags.cpp b/tools/flags/SkCommandLineFlags.cpp
index b4bcf68..8e38c52 100644
--- a/tools/flags/SkCommandLineFlags.cpp
+++ b/tools/flags/SkCommandLineFlags.cpp
@@ -217,7 +217,7 @@
 };
 }  // namespace
 
-void SkCommandLineFlags::Parse(int argc, char** argv) {
+void SkCommandLineFlags::Parse(int argc, const char* const * argv) {
     // Only allow calling this function once.
     static bool gOnce;
     if (gOnce) {