Revert of Allow frames to be free'd even for static images

Source/platform/image-decoders/ImageDecoderTest.cpp

Index: Source/platform/image-decoders/ImageDecoderTest.cpp
diff --git a/Source/platform/image-decoders/ImageDecoderTest.cpp b/Source/platform/image-decoders/ImageDecoderTest.cpp
index 5647e94e64611ea73aa997cc32d3ce5560376688..9d4ba3b742ff66f2af84ea671d46183ebb22e146 100644
--- a/Source/platform/image-decoders/ImageDecoderTest.cpp
+++ b/Source/platform/image-decoders/ImageDecoderTest.cpp
@@ -221,21 +221,11 @@
         frameBuffers[i].setStatus(i % 2 ? ImageFrame::FramePartial : ImageFrame::FrameComplete);
 
     decoder->clearCacheExceptFrame(kNotFound);
+
     for (size_t i = 0; i < numFrames; ++i) {
         SCOPED_TRACE(testing::Message() << i);
         EXPECT_EQ(ImageFrame::FrameEmpty, frameBuffers[i].status());
     }
-}
-
-TEST(ImageDecoderTest, clearCacheExceptFrameAllSingleFrame)
-{
-    OwnPtr<TestImageDecoder> decoder(adoptPtr(new TestImageDecoder()));
-    decoder->initFrames(1);
-    ImageFrame* frame = &decoder->frameBufferCache().first();
-    frame->setStatus(ImageFrame::FrameComplete);
-
-    decoder->clearCacheExceptFrame(kNotFound);
-    EXPECT_EQ(ImageFrame::FrameEmpty, frame->status());
 }
 
 TEST(ImageDecoderTest, clearCacheExceptFramePreverveClearExceptFrame)