Change the USB extension API to use ArrayBuffers.

chrome/common/extensions/api/experimental_usb.idl

Index: chrome/common/extensions/api/experimental_usb.idl
diff --git a/chrome/common/extensions/api/experimental_usb.idl b/chrome/common/extensions/api/experimental_usb.idl
index 55affc30a0d0388444ddda11c70e5177b67fc84a..e0a765d3737a017985e1b46aec41aa44c7830636 100644
--- a/chrome/common/extensions/api/experimental_usb.idl
+++ b/chrome/common/extensions/api/experimental_usb.idl
@@ -42,7 +42,7 @@
 
     // The data payload carried by this transfer. If this is an output tranfer
     // then this field must be set.
-    long[]? data;
+    ArrayBuffer? data;
   };
 
   // GenericTransferInfo is used by both bulk and interrupt transfers to
@@ -59,7 +59,7 @@
 
     // If this is an output transfer then this field must be populated.
     // Otherwise, it will be ignored.
-    long[]? data;
+    ArrayBuffer? data;
   };
 
   // IsochronousTransferInfo describes a single multi-packet isochronous
@@ -92,7 +92,7 @@
 
     // If the transfer was an input transfer then this field will contain all
     // of the input data requested.
-    long[]? data;
+    ArrayBuffer? data;
 
     // The following fields are used for internal event routing and can be
     // ignored.
@@ -103,10 +103,6 @@
   callback OnEventCallback = void (UsbEvent event);
 
   dictionary DeviceOptions {
-    // The schema generator does not support dictionaries with only events.
-    // Ignore this field.
-    [nodoc] long? dummyValue;
-
     // Invoked by the extension API whenever an event occurs for the device(s)
     // that this DeviceOptions is associated with.
     OnEventCallback? onEvent;