drive: Deal with the root directory in the same way as others in MoveOperation.

chrome/browser/google_apis/gdata_wapi_url_generator.cc

Index: chrome/browser/google_apis/gdata_wapi_url_generator.cc
diff --git a/chrome/browser/google_apis/gdata_wapi_url_generator.cc b/chrome/browser/google_apis/gdata_wapi_url_generator.cc
index ac38ef6623382665ab50213430da78698e778672..527ec49d7b4f9b686168c9bc750624f2beea227a 100644
--- a/chrome/browser/google_apis/gdata_wapi_url_generator.cc
+++ b/chrome/browser/google_apis/gdata_wapi_url_generator.cc
@@ -32,6 +32,10 @@ const char kResourceListRootURL[] = "/feeds/default/private/full";
 // Metadata feed with things like user quota.
 const char kAccountMetadataURL[] = "/feeds/metadata/default";
 
+// URL for the content_url of the root directory.
+const char kRootContentURL[] =
+    "/feeds/default/private/full/folder%3Aroot/contents";
+
 #ifndef NDEBUG
 // Use smaller 'page' size while debugging to ensure we hit feed reload
 // almost always. Be careful not to use something too small on account that
@@ -161,4 +165,8 @@ GURL GDataWapiUrlGenerator::GenerateAccountMetadataUrl() const {
   return AddMetadataUrlParams(base_url_.Resolve(kAccountMetadataURL));
 }
 
+GURL GDataWapiUrlGenerator::GenerateRootContentUrl() const {
+  return base_url_.Resolve(kRootContentURL);
+}
+
 }  // namespace google_apis