MIPS: Simplify known successor block lowering.

src/mips/lithium-mips.h

Index: src/mips/lithium-mips.h
diff --git a/src/mips/lithium-mips.h b/src/mips/lithium-mips.h
index 211d37bca5105e66394211f5199a1b2181aa8376..a2c6dfc95fe36d9e4332dba81d9361213aafc4e5 100644
--- a/src/mips/lithium-mips.h
+++ b/src/mips/lithium-mips.h
@@ -2655,8 +2655,6 @@ class LChunkBuilder V8_FINAL : public LChunkBuilderBase {
   // Build the sequence for the graph.
   LPlatformChunk* Build();
 
-  LInstruction* CheckElideControlInstruction(HControlInstruction* instr);
-
   // Declare methods that deal with the individual node types.
 #define DECLARE_DO(type) LInstruction* Do##type(H##type* node);
   HYDROGEN_CONCRETE_INSTRUCTION_LIST(DECLARE_DO)