drive: Rename DriveResourceMetadata to ResourceMetadata

As part of an effort to remove 'drive' prefix from c/b/chromeos/drive.

BUG=231807
TEST=none
[email protected]
# for chrome/browser/ui/webui/screenshot_source.h

Review URL: https://codereview.chromium.org/14002010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@196668 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/chromeos/drive/drive.proto b/chrome/browser/chromeos/drive/drive.proto
index 339569b..1dbe24ed 100644
--- a/chrome/browser/chromeos/drive/drive.proto
+++ b/chrome/browser/chromeos/drive/drive.proto
@@ -82,8 +82,8 @@
   optional DriveDirectorySpecificInfo directory_specific_info = 13;
 }
 
-// Container for the header part of DriveResourceMetadata.
-message DriveResourceMetadataHeader {
+// Container for the header part of ResourceMetadata.
+message ResourceMetadataHeader {
   // Monotonically increasing version number, which is changed when
   // incompatible change is made to the DB format. kDBVersion in
   // drive_resource_metadata_storage.h defines the current version.