Update V8 to r5780 as required by WebKit r71558

Change-Id: Ie3936550b99967a13755930d0dac0a59c3562625
diff --git a/src/debug-debugger.js b/src/debug-debugger.js
index a0c6808..d091991 100644
--- a/src/debug-debugger.js
+++ b/src/debug-debugger.js
@@ -897,10 +897,6 @@
   return new FrameMirror(this.break_id, opt_index);
 };
 
-ExecutionState.prototype.cframesValue = function(opt_from_index, opt_to_index) {
-  return %GetCFrames(this.break_id);
-};
-
 ExecutionState.prototype.setSelectedFrame = function(index) {
   var i = %ToNumber(index);
   if (i < 0 || i >= this.frameCount()) throw new Error('Illegal frame index.');
@@ -1301,7 +1297,7 @@
   try {
     try {
       // Convert the JSON string to an object.
-      request = %CompileString('(' + json_request + ')', false)();
+      request = %CompileString('(' + json_request + ')')();
 
       // Create an initial response.
       response = this.createResponse(request);
@@ -1751,11 +1747,6 @@
 };
 
 
-DebugCommandProcessor.prototype.backtracec = function(cmd, args) {
-  return this.exec_state_.cframesValue();
-};
-
-
 DebugCommandProcessor.prototype.frameRequest_ = function(request, response) {
   // No frames no source.
   if (this.exec_state_.frameCount() == 0) {
@@ -2205,29 +2196,6 @@
   return r;
 };
 
-DebugCommandProcessor.prototype.formatCFrames = function(cframes_value) {
-  var result = "";
-  if (cframes_value == null || cframes_value.length == 0) {
-    result += "(stack empty)";
-  } else {
-    for (var i = 0; i < cframes_value.length; ++i) {
-      if (i != 0) result += "\n";
-      result += this.formatCFrame(cframes_value[i]);
-    }
-  }
-  return result;
-};
-
-
-DebugCommandProcessor.prototype.formatCFrame = function(cframe_value) {
-  var result = "";
-  result += "0x" + NumberToHex8Str(cframe_value.address);
-  if (!IS_UNDEFINED(cframe_value.text)) {
-    result += " " + cframe_value.text;
-  }
-  return result;
-}
-
 
 /**
  * Convert an Object to its debugger protocol representation. The representation