Remove static initializer for SkOpts::Init()

Static initializers run in a confusing unspecified order,
so it's best to have as few of them as possible.

Most tools and clients I can find already call SkGraphics::Init(),
(or equivalently create an SkAutoGraphics) which calls SkOpts::Init():
   - Chrome
   - Chrome renderer
   - Android
   - DM
   - nanobench
   - SampleApp
   - VisualBench
   - the old debugger

Seems like the only thing relying on this static initializer today is
the new debugger, fixed here.

TBR=reed@google.com

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1903503002

Review URL: https://codereview.chromium.org/1903503002
diff --git a/src/core/SkOpts.h b/src/core/SkOpts.h
index bc3ea00..04c9f00 100644
--- a/src/core/SkOpts.h
+++ b/src/core/SkOpts.h
@@ -17,7 +17,7 @@
 namespace SkOpts {
     // Call to replace pointers to portable functions with pointers to CPU-specific functions.
     // Thread-safe and idempotent.
-    // Called by SkGraphics::Init(), and automatically #if SK_ALLOW_STATIC_GLOBAL_INITIALIZERS.
+    // Called by SkGraphics::Init().
     void Init();
 
     // Declare function pointers here...