[cros] Add checkbox for toggling data roaming setting.

chrome/browser/resources/options/chromeos_internet_options_page.css

 /*
  * TODO(xiyuan): Remove the section overrides when options_page.css uses the
  * new style.
  */
 #inetTitle {
   border: none;
 }
 
 #internetPage > section > h3 {
   font-size: 100%;
@@ skipping 151 matching lines @@
   padding: 5px;
   height: 21px;
   vertical-align: middle;
   width: 24px;
 }
 
 #accessLockedText {
   vertical-align: middle;
 }
 
+#internetOwnerOnlyWarning {  
+  margin-bottom: 10px;
+  margin-top: 10px;
+  -webkit-padding-start: 20px;
+  background-repeat: no-repeat;
+  background-image: url('warning.png');
+}
+
 #internetPage:not([accesslocked]) #lockedNetworkBanner,
 #internetPage[accesslocked] #wirelessButtons,
 #internetPage[accesslocked] #wiredSection,
 #internetPage[accesslocked] #wirelessSection,
 #internetPage[accesslocked] #rememberedSection,
 #internetPage[accesslocked] #detailsInternetPage {
   display: none;
 }
 
 #detailsInternetPage:not([connected]) > #advancedSection,
@@ skipping 14 matching lines @@
 #detailsInternetPage[cert] .password-details,
 #detailsInternetPage[certPkcs] .password-details,
 #detailsInternetPage:not([cert]) .cert-details,
 #detailsInternetPage:not([certPkcs]) .cert-pkcs-details {
   display: none;
 }
 
 #wirelessButtons > * > button {
   margin-left: 5px;
 }