DevTools: [Console] wrap long strings in console

The "white-space: pre" was introduced in crrev.com/1304033003 to avoid
spaces collapsing.

The "white-space: pre-wrap" does not collapse spaces and wraps text
if needed.

BUG=583644
R=pfeldman, dgozman

Review URL: https://codereview.chromium.org/1681013002

Cr-Commit-Position: refs/heads/master@{#374292}

front_end/components/objectValue.css

@@ -60,7 +60,7 @@
 .object-value-regexp,
 .object-value-symbol {
     color: rgb(196, 26, 22);
-    white-space: pre;
+    white-space: pre-wrap;
     unicode-bidi: -webkit-isolate;
 }