Update V8 to r6190 as required by WebKit r75315

Change-Id: I0b2f598e4d8748df417ad350fc47a1c465ad1fef
diff --git a/src/deoptimizer.h b/src/deoptimizer.h
index 2d7dfc8..f9bf280 100644
--- a/src/deoptimizer.h
+++ b/src/deoptimizer.h
@@ -145,9 +145,9 @@
 
   static Address GetDeoptimizationEntry(int id, BailoutType type);
   static int GetDeoptimizationId(Address addr, BailoutType type);
-  static unsigned GetOutputInfo(DeoptimizationOutputData* data,
-                                unsigned node_id,
-                                SharedFunctionInfo* shared);
+  static int GetOutputInfo(DeoptimizationOutputData* data,
+                           unsigned node_id,
+                           SharedFunctionInfo* shared);
 
   static void Setup();
   static void TearDown();