Added flags to prevent messing with network connections while 3G device is be...

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 {
   display: block;
@@ skipping 132 matching lines @@
 #planWarning {
   width: 350px;
   padding-top: 5px;
   font-weight: bold;
 }
 
 html[dir='rtl'] .details-button {
   float: left;
 }
 
+#lockedNetworkBanner {
+  height: 31px;
+  width: 100%;
+  margin: 0;
+  padding-top: 10px;
+  vertical-align: middle;
+}
+
+#lockedNetworkIcon {
+  background-image: url("chrome://theme/IDR_WARNING");
+  background-repeat: no-repeat;
+  background-position:center;
+  display: inline-block;
+  padding: 5px;
+  height: 21px;
+  vertical-align: middle;
+  width: 24px;
+}
+
+#accessLockedText {
+  vertical-align: middle;
+}
+
+#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,
 #detailsInternetPage[connecting] > * > #detailsInternetLogin,
 #detailsInternetPage[connected] > * > #detailsInternetLogin,
 #detailsInternetPage:not([connected])  > * > #buyplanDetails,
 #detailsInternetPage:not([wireless]) > * > #detailsInternetOk,
 #detailsInternetPage[ethernet] .wifi-details,
 #detailsInternetPage[ethernet] .cellular-details,
 #detailsInternetPage[cellular] .wifi-details,
 #detailsInternetPage:not([cellular])  > * > #activateDetails,
 #detailsInternetPage:not([cellular])  > * > #buyplanDetails,
@@ skipping 16 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;
 }