Rename chrome.fileSystem apis to be expandable to directories if we wish.

chrome/common/extensions/docs/server2/templates/articles/app_storage.html

 <h1>Manage Data</h1>
 
 
 <p>
 Almost every aspect of app development involves some element
 of sending or receiving data.
 Starting with the basics,
 you should use an MVC framework to help you design and implement your app
 so that data is completely separate from the app's view on that data
 (see <a href="app_frameworks.html">MVC Architecture</a>).
@@ skipping 149 matching lines @@
 <p>
 The following code opens the file (read-only) and
 reads it as text using a <code>FileReader</code> object.
 If the file doesn't exist, an error is thrown.
 </p>
 
 <pre>
 var chosenFileEntry = null;
 
 chooseFileButton.addEventListener('click', function(e) {
-  chrome.fileSystem.chooseFile({type: 'openFile'}, function(readOnlyEntry) {
+  chrome.fileSystem.chooseEntry({type: 'openFile'}, function(readOnlyEntry) {
  
     readOnlyEntry.file(function(file) {
       var reader = new FileReader();
 
       reader.onerror = errorHandler;
       reader.onloadend = function(e) {
         console.log(e.target.result);
       };
 
       reader.readAsText(file);
     });
         });
 });
 </pre>
 
 <h2 id="write">Writing a file</h2>
 
 <p>
 The two common use-cases
 for writing a file are "Save" and "Save as".
 The following code creates a
-<code>writableFileEntry</code>
+<code>writableEntry</code>
 from the read-only <code>chosenFileEntry</code> and
 writes the selected file to it.
 </p>
 
 <pre>
- chrome.fileSystem.getWritableFileEntry(chosenFileEntry, function(writableFileEntry) {
+ chrome.fileSystem.getWritableEntry(chosenFileEntry, function(writableFileEntry) {
     writableFileEntry.createWriter(function(writer) {
       writer.onerror = errorHandler;
       writer.onwriteend = callback;
 
     chosenFileEntry.file(function(file) {
       writer.write(file);
     });   
   }, errorHandler);
 });
 </pre>
 
 <p>
 The following code creates a new file
 with "Save as" functionality and
 writes the new blob to the file
 using the <code>writer.write()</code> method.
 </p>
 
 <pre>
-chrome.fileSystem.chooseFile({type: 'saveFile'}, function(writableFileEntry) {
+chrome.fileSystem.chooseEntry({type: 'saveFile'}, function(writableFileEntry) {
     writableFileEntry.createWriter(function(writer) {
       writer.onerror = errorHandler;
       writer.onwriteend = function(e) {
         console.log('write complete');
       };
       writer.write(new Blob(['1234567890'], {type: 'text/plain'}));  
     }, errorHandler);
 });
 </pre>
 
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