Support accept attribute for an <input type=file> element....

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
===================================================================
--- chrome/app/generated_resources.grd	(revision 58709)
+++ chrome/app/generated_resources.grd	(working copy)
@@ -9509,6 +9509,19 @@
       No audio recording devices found. Please check if you have a microphone properly connected before trying again.
     </message>
 
+    <message name="IDS_IMAGE_FILES" desc="The description of the image file extensions in the select file dialog.">
+      Image Files
+    </message>
+    <message name="IDS_AUDIO_FILES" desc="The description of the audio file extensions in the select file dialog.">
+      Audio Files
+    </message>
+    <message name="IDS_VIDEO_FILES" desc="The description of the video file extensions in the select file dialog.">
+      Video Files
+    </message>
+    <message name="IDS_CUSTOM_FILES" desc="The description of the custom file extensions in the select file dialog.">
+      Custom Files
+    </message>
+
     </messages>
 
     <structures fallback_to_english="true">