Pull up clearCacheExceptFrame to ImageDecoder.

third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp

Index: third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
diff --git a/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp b/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
index 504b59a0a192b5f6cf363f98c3bd8e0f598362ee..7456b179453fcb96d293880471d5f1db30780a34 100644
--- a/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
+++ b/third_party/WebKit/Source/platform/image-decoders/webp/WEBPImageDecoder.cpp
@@ -265,35 +265,6 @@ bool WEBPImageDecoder::canReusePreviousFrameBuffer(size_t frameIndex) const {
          ImageFrame::BlendAtopPreviousFrame;
 }
 
-size_t WEBPImageDecoder::clearCacheExceptFrame(size_t clearExceptFrame) {
-  // Don't clear if there are no frames, or only one.
-  if (m_frameBufferCache.size() <= 1)
-    return 0;
-
-  // If |clearExceptFrame| has status FrameComplete, we only preserve that
-  // frame.  Otherwise, we *also* preserve the most recent previous frame with
-  // status FrameComplete whose data will be required to decode
-  // |clearExceptFrame|, either in initFrameBuffer() or ApplyPostProcessing().
-  // This frame index is stored in |clearExceptFrame2|.  All other frames can
-  // be cleared.
-  size_t clearExceptFrame2 = kNotFound;
-  if (clearExceptFrame < m_frameBufferCache.size() &&
-      m_frameBufferCache[clearExceptFrame].getStatus() !=
-          ImageFrame::FrameComplete) {
-    clearExceptFrame2 =
-        m_frameBufferCache[clearExceptFrame].requiredPreviousFrameIndex();
-  }
-
-  while ((clearExceptFrame2 < m_frameBufferCache.size()) &&
-         (m_frameBufferCache[clearExceptFrame2].getStatus() !=
-          ImageFrame::FrameComplete)) {
-    clearExceptFrame2 =
-        m_frameBufferCache[clearExceptFrame2].requiredPreviousFrameIndex();
-  }
-
-  return clearCacheExceptTwoFrames(clearExceptFrame, clearExceptFrame2);
-}
-
 void WEBPImageDecoder::clearFrameBuffer(size_t frameIndex) {
   if (m_demux && m_demuxState >= WEBP_DEMUX_PARSED_HEADER &&
       m_frameBufferCache[frameIndex].getStatus() == ImageFrame::FramePartial) {