Some filebrowser bugs and retiring DiskChanged event in filebrowser

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
===================================================================
--- chrome/app/generated_resources.grd	(revision 95171)
+++ chrome/app/generated_resources.grd	(working copy)
@@ -12219,6 +12219,12 @@
       <message name="IDS_REMOVABLE_DEVICE_SCANNING_MESSAGE" desc="Text of notification message which is shown when user inserts removable device (SD card, USB key...)">
         Scanning content...
       </message>
+      <message name="IDS_DEVICE_UNSUPPORTED_MESSAGE" desc="Text of notification message which is shown when user inserts removable device (SD card, USB key...)">
+       Sorry, <ph name="DEVICE_LABEL">$1<ex>SD card</ex></ph> is not supported on your Chromebook at this time.

[zel, 2011/08/08 18:47:19]

string changes can't be in for M14. please take a look at the existing strings
and see if you can use some of them now instead. the message does not have to be
so verbose.

for m15, send these two sentences to Ken/Josh to approve them  

[tbarzic, 2011/08/09 00:03:34]

Done.

+      </message>
+      <message name="IDS_DEVICE_UNSUPPORTED_DEFAULT_MESSAGE" desc="Text of notification message which is shown when user inserts removable device (SD card, USB key...)">
+       Sorry, the external storage device is not supported on your Chromebook at this time.
+      </message>
 
       <!-- Formatting device notifications -->
       <message name="IDS_FORMATTING_OF_DEVICE_PENDING_TITLE" desc="Text of notification message which is shown when formatting process of some device is pending">