Set root resource ID upon full feed update.

chrome/browser/chromeos/drive/drive_resource_metadata_unittest.cc

Index: chrome/browser/chromeos/drive/drive_resource_metadata_unittest.cc
diff --git a/chrome/browser/chromeos/drive/drive_resource_metadata_unittest.cc b/chrome/browser/chromeos/drive/drive_resource_metadata_unittest.cc
index 45300dd41f0118cd777198e1b472e9e28b28dd0a..200a777fdebf1b1dbb899900234b30694fedbf9a 100644
--- a/chrome/browser/chromeos/drive/drive_resource_metadata_unittest.cc
+++ b/chrome/browser/chromeos/drive/drive_resource_metadata_unittest.cc
@@ -167,9 +167,9 @@ TEST_F(DriveResourceMetadataTest, GetEntryByResourceId_RootDirectory) {
   DriveResourceMetadata resource_metadata;
   // Look up the root directory by its resource ID.
   DriveEntry* entry = resource_metadata.GetEntryByResourceId(
-      kDriveRootDirectoryResourceId);
+      resource_metadata.root_resource_id());
   ASSERT_TRUE(entry);
-  EXPECT_EQ(kDriveRootDirectoryResourceId, entry->resource_id());
+  EXPECT_EQ(resource_metadata.root_resource_id(), entry->resource_id());
 }
 
 TEST_F(DriveResourceMetadataTest, GetEntryInfoByResourceId) {
@@ -451,7 +451,7 @@ TEST_F(DriveResourceMetadataTest, RemoveEntryFromParent) {
 
   // Try removing root. This should fail.
   resource_metadata_.RemoveEntryFromParent(
-      kDriveRootDirectoryResourceId,
+      resource_metadata_.root_resource_id(),
       base::Bind(&test_util::CopyResultsFromFileMoveCallback,
           &error, &drive_file_path));
   gdata::test_util::RunBlockingPoolTask();