Wrap long policy values on chrome://policy

This CL changes chrome/browser/resources/policy/policy.css to wrap policy values when they are too
long. The problem was reported for policy value of OpenNetworkConfiguration. A screenshot of the
new policy page has been added to the bug thread.

Bug: 585629
Change-Id: I0804ab8ddd743d6861eb0e3afa3be781a76fc4cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1778049Reviewed-by: Lutz Justen <ljusten@chromium.org>
Reviewed-by: Denis Kuznetsov <antrim@chromium.org>
Reviewed-by: Yann Dago <ydago@chromium.org>
Commit-Queue: Felipe Andrade <fsandrade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693716}

chrome/browser/resources/policy/policy.css

@@ -86,8 +86,9 @@ body > main {
   flex-grow: 1;
   max-height: 200px;
   overflow: auto;
+  overflow-wrap: break-word;
   text-overflow: unset;
-  white-space: pre;
+  white-space: pre-wrap;
 }
 
 <if expr="not is_android">
@@ -219,4 +220,4 @@ body > main {
   display: block;
   flex: 1;
 }
-</if>
+</if>
\ No newline at end of file