Auto-rebaseline for r159282

http://src.chromium.org/viewvc/blink?view=revision&revision=159282

BUG=285397
TBR=bokan@chromium.org

Review URL: https://codereview.chromium.org/26164012

git-svn-id: svn://svn.chromium.org/blink/trunk@159295 bbb929c8-8fbe-4397-9dbb-9b2b20218538
[FileReaderLoader] Remove isCompleted() method

- Replace isCompleted() used for checking if slicing is needed with
  m_rawData->byteLength() == m_bytesLoaded
- Replace isCompleted() used really for checking if loading is completed with
  m_finishedLoading

BUG=

Review URL: https://codereview.chromium.org/26485002

git-svn-id: svn://svn.chromium.org/blink/trunk@159296 bbb929c8-8fbe-4397-9dbb-9b2b20218538