[i18n] chromeos first run, i18n-content to $i18n{}

This is a mechanical change to convert i18n-content to $i18n{} tags.

BUG=677338
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2625873006
Cr-Commit-Position: refs/heads/master@{#443108}

chrome/browser/resources/chromeos/first_run/app/main.html

@@ -26,14 +26,14 @@
           </div>
         </div>
       </div>
-      <h1 i18n-content="greetingHeader"></h1>
+      <h1>$i18n{greetingHeader}</h1>
       <p>
-        <span i18n-content="greetingText1"></span><br>
-        <span i18n-content="greetingText2"></span>
+        <span>$i18n{greetingText1}</span><br>
+        <span>$i18n{greetingText2}</span>
       </p>
       <div class="controls">
-        <button i18n-content="greetingButton"
-            class="next-button custom-appearance blue-button" tabindex="0">
+        <button class="next-button custom-appearance blue-button" tabindex="0">
+          $i18n{greetingButton}
         </button>
       </div>
       <include src="greeting_image_[GREETING_IMAGE].html">

chrome/browser/resources/chromeos/first_run/app_list_step.html

 <div id="app-list" class="step bubble transparent hidden">
-  <h1 i18n-content="appListHeader"></h1>
+  <h1>$i18n{appListHeader}</h1>
   <p>
-    <span i18n-content="appListText1"></span><br>
-    <span i18n-content="appListText2"></span>
+    <span>$i18n{appListText1}</span><br>
+    <span>$i18n{appListText2}</span>
   </p>
   <div class="controls">
-    <button i18n-content="nextButton"
-        class="next-button custom-appearance blue-button"></button>
+    <button class="next-button custom-appearance blue-button">
+      $i18n{nextButton}
+    </button>
   </div>
 </div>

chrome/browser/resources/chromeos/first_run/help_step.html

 <div id="help" class="step bubble transparent hidden">
   <div id="completion-image"></div>
-  <h1 i18n-content="helpHeader"></h1>
-  <p i18n-content="helpText1"></p>
-  <p i18n-content="helpText2"></p>
+  <h1>$i18n{helpHeader}</h1>
+  <p>$i18n{helpText1}</p>
+  <p>$i18n{helpText2}</p>
   <div class="controls">
-    <button i18n-content="helpKeepExploringButton"
-        class="help-button custom-appearance blue-button"></button>
-    <button i18n-content="helpFinishButton"
-        class="next-button custom-appearance white-button"></button>
+    <button class="help-button custom-appearance blue-button">
+      $i18n{helpKeepExploringButton}
+    </button>
+    <button class="next-button custom-appearance white-button">
+      $i18n{helpFinishButton}
+    </button>
   </div>
 </div>

chrome/browser/resources/chromeos/first_run/tray_step.html

 <div id="tray" class="step bubble transparent hidden">
-  <h1 i18n-content="trayHeader"></h1>
-  <p i18n-content="trayText"><p>
+  <h1>$i18n{trayHeader}</h1>
+  <p>$i18n{trayText}<p>
   <div class="controls">
-    <button i18n-content="nextButton"
-        class="next-button custom-appearance blue-button"></button>
+    <button class="next-button custom-appearance blue-button">
+      $i18n{nextButton}
+    </button>
   </div>
 </div>