chromeos: Rename DriveDownloadHandler::GetDrivePath() to GetTargetPath(), make it return full path

chrome/browser/chromeos/drive/drive_download_handler.h

Index: chrome/browser/chromeos/drive/drive_download_handler.h
diff --git a/chrome/browser/chromeos/drive/drive_download_handler.h b/chrome/browser/chromeos/drive/drive_download_handler.h
index ec82b766db81b951581cbf4978e04b341e8f28cf..effe3436f5b0708c6e7b4a8609df5e6cc1de9c5a 100644
--- a/chrome/browser/chromeos/drive/drive_download_handler.h
+++ b/chrome/browser/chromeos/drive/drive_download_handler.h
@@ -54,11 +54,8 @@ class DriveDownloadHandler : public AllDownloadItemNotifier::Observer {
   void SetDownloadParams(const FilePath& drive_path,
                          content::DownloadItem* download);
 
-  // Gets the drive_path from external data in |download|.
-  // GetDrivePath may return an empty path in case SetDrivePath was not
-  // previously called or there was some other internal error
-  // (there is a DCHECK for this).
-  FilePath GetDrivePath(const content::DownloadItem* download);
+  // Gets the target drive path from external data in |download|.
+  FilePath GetTargetPath(const content::DownloadItem* download);
 
   // Checks if there is a Drive upload associated with |download|
   bool IsDriveDownload(const content::DownloadItem* download);