Add an extension override bubble and warning box for proxy extensions.

chrome/browser/resources/options/browser_options.html

Index: chrome/browser/resources/options/browser_options.html
diff --git a/chrome/browser/resources/options/browser_options.html b/chrome/browser/resources/options/browser_options.html
index f225218330ea7ecfb65a5b45004d9113d51f009d..28746d810dc179a39e148a2d85fb1d81c988419b 100644
--- a/chrome/browser/resources/options/browser_options.html
+++ b/chrome/browser/resources/options/browser_options.html
@@ -30,6 +30,11 @@
   <include src="startup_section.html">
 </if>
   <section>
+    <h3 id="proxy-section" i18n-content="sectionTitleProxy" hidden></h3>

[Dan Beam, 2014/05/20 16:46:41]

can you hide the whole <section> instead?

[Finnur, 2014/05/21 16:30:32]

Indeed.

+    <div id="proxy-section-content"></div>
+  </section>
+
+  <section>
     <h3 i18n-content="sectionTitleAppearance"></h3>
     <div class="settings-row">
 <if expr="chromeos">
@@ -556,7 +561,9 @@
   <section id="network-section">
     <h3 i18n-content="advancedSectionTitleNetwork"></h3>
     <div>
-      <span id="proxiesLabel" class="settings-row"></span>
+      <span id="proxiesLabel"
+            class="settings-row"
+            i18n-content="proxiesLabelSystem"></span>
       <div class="settings-row">
         <button id="proxiesConfigureButton"
             i18n-content="proxiesConfigureButton"></button>