Update V8 to r4851 as required by WebKit r61121

Change-Id: Ib01b7c8e38d5b82b254192fc06365aa5b85780c5
diff --git a/test/mjsunit/debug-conditional-breakpoints.js b/test/mjsunit/debug-conditional-breakpoints.js
index 5859451..bd4cdd1 100644
--- a/test/mjsunit/debug-conditional-breakpoints.js
+++ b/test/mjsunit/debug-conditional-breakpoints.js
@@ -45,7 +45,7 @@
 count = 0;
 function f() {};
 function g() {h(count++)};
-function h(x) {var a=x;};
+function h(x) {var a=x; return a};
 
 
 // Conditional breakpoint which syntax error.
@@ -136,7 +136,7 @@
 
 // Conditional breakpoint which checks a local variable.
 break_point_hit_count = 0;
-bp = Debug.setBreakPoint(h, 0, 0, 'a % 2 == 0');
+bp = Debug.setBreakPoint(h, 0, 23, 'a % 2 == 0');
 for (var i = 0; i < 10; i++) {
   g();
 }
@@ -146,8 +146,8 @@
 
 // Multiple conditional breakpoint which the same condition.
 break_point_hit_count = 0;
-bp1 = Debug.setBreakPoint(h, 0, 0, 'a % 2 == 0');
-bp2 = Debug.setBreakPoint(h, 0, 0, 'a % 2 == 0');
+bp1 = Debug.setBreakPoint(h, 0, 23, 'a % 2 == 0');
+bp2 = Debug.setBreakPoint(h, 0, 23, 'a % 2 == 0');
 for (var i = 0; i < 10; i++) {
   g();
 }
@@ -159,8 +159,8 @@
 
 // Multiple conditional breakpoint which different conditions.
 break_point_hit_count = 0;
-bp1 = Debug.setBreakPoint(h, 0, 0, 'a % 2 == 0');
-bp2 = Debug.setBreakPoint(h, 0, 0, '(a + 1) % 2 == 0');
+bp1 = Debug.setBreakPoint(h, 0, 23, 'a % 2 == 0');
+bp2 = Debug.setBreakPoint(h, 0, 23, '(a + 1) % 2 == 0');
 for (var i = 0; i < 10; i++) {
   g();
 }