Limit the number of captured events held by about:net-internals.

chrome/browser/resources/net_internals/capture_view.html

Index: chrome/browser/resources/net_internals/capture_view.html
diff --git a/chrome/browser/resources/net_internals/capture_view.html b/chrome/browser/resources/net_internals/capture_view.html
index 818b3c969a4159a92a2783b2064da9928e85987f..2d384fad4e340e8009a573e410be2ac105bfc6e2 100644
--- a/chrome/browser/resources/net_internals/capture_view.html
+++ b/chrome/browser/resources/net_internals/capture_view.html
@@ -1,9 +1,18 @@
 <div id=capture-view-tab-content class=content-box>
   <h2>Capture options</h2>
+
+  <input id=capture-view-limit-checkbox type=checkbox />
+  <label for='capture-view-limit-checkbox'
+         title='If you capture all events for a long time, it is possible to exhaust memory and crash. Throwing out older data avoids this problem.'>
+    Discard old data under memory pressure.
+  </label>
+
+  <br/>
+
   <input id=capture-view-byte-logging-checkbox type=checkbox />
-  <label for='capture-view-byte-logging-checkbox'>
+  <label for='capture-view-byte-logging-checkbox'
+         title='This will result in huge log files, and can expose sensitive data'>

[mmenke, 2012/03/06 15:21:18]

I don't think titles are sufficiently visible for this kind of information. 
They require a brief hover time.  Also, people will generally click the
checkbox, rather than the text, and they'll never see the text when hovering
over the checkbox.

[eroman, 2012/03/06 17:14:14]

Restored to italic. Here is what it looks like: http://i.imgur.com/gsLde.png

     Include the actual bytes sent/received.
-    <i>(This will result in huge log files, and can expose sensitive data)</i>
   </label>
 
   <ul>