Fixed Code::FindCodeAgeSequence logic, removing a dead method on the way.

src/mips/assembler-mips.h

Index: src/mips/assembler-mips.h
diff --git a/src/mips/assembler-mips.h b/src/mips/assembler-mips.h
index 22396b37d09e253b42550e9a2e76e39cf697b446..fd2ff0daa2804c3abd1d21caa84d15dd8070ccd6 100644
--- a/src/mips/assembler-mips.h
+++ b/src/mips/assembler-mips.h
@@ -525,9 +525,6 @@ class Assembler : public AssemblerBase {
   Assembler(Isolate* isolate, void* buffer, int buffer_size);
   ~Assembler();
 
-  // Dummy for cross platform compatibility.
-  void set_predictable_code_size(bool value) { }
-
   // GetCode emits any pending (non-emitted) code and fills the descriptor
   // desc. GetCode() is idempotent; it returns the same result if no other
   // Assembler functions are invoked in between GetCode() calls.