DevTools: Show -0 for negative zero in console.

LayoutTests/inspector/console/console-format-expected.txt

Index: LayoutTests/inspector/console/console-format-expected.txt
diff --git a/LayoutTests/inspector/console/console-format-expected.txt b/LayoutTests/inspector/console/console-format-expected.txt
index b72e61701226e05228b2099a84478bf338ae855b..797aaaa35d716346374fcc6d21bb4ca4e1921e56 100644
--- a/LayoutTests/inspector/console/console-format-expected.txt
+++ b/LayoutTests/inspector/console/console-format-expected.txt
@@ -58,6 +58,8 @@ CONSOLE MESSAGE: line 12: [object SVGSVGElement]
 CONSOLE MESSAGE: line 13: [object SVGSVGElement]
 CONSOLE MESSAGE: line 12: [object Object]
 CONSOLE MESSAGE: line 13: [object Object]
+CONSOLE MESSAGE: line 12: 0
+CONSOLE MESSAGE: line 13: 0
 CONSOLE MESSAGE: line 12: 
 CONSOLE MESSAGE: line 13: 
 CONSOLE MESSAGE: line 12: function Object() { [native code] }
@@ -178,16 +180,20 @@ Object {bar: (...), foo: 1} console-format.html:12
 [Object]0: Objectlength: 1__proto__: Array[0] console-format.html:13
 globals[25]
 Object {bar: (...), foo: 1}
+-0 console-format.html:12
+[-0] console-format.html:13
+globals[26]
+-0
 Object {} console-format.html:12
 [Object]0: Objectlength: 1__proto__: Array[0] console-format.html:13
-globals[26]
+globals[27]
 Object {}
 function Object() { [native code] } console-format.html:12
 [function]0: function Object() { [native code] }length: 1__proto__: Array[0] console-format.html:13
-globals[27]
+globals[28]
 function Object() { [native code] }
 Object {} console-format.html:12
 [Object]0: Objectlength: 1__proto__: Array[0] console-format.html:13
-globals[28]
+globals[29]
 Object {}