DrawingBuffer cleanup: Part 1 of many

third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h

Index: third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h
diff --git a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h
index 3db717c560275f83269fdd6457dadbea04256130..cf72de0b644fd67ebb0d7581cebb078188172d82 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h
+++ b/third_party/WebKit/Source/platform/graphics/gpu/DrawingBuffer.h
@@ -323,7 +323,6 @@ class PLATFORM_EXPORT DrawingBuffer
     DISALLOW_NEW();
     GLuint textureId = 0;
     GLuint imageId = 0;
-    bool immutable = false;
     TextureParameters parameters;
   };
 
@@ -363,10 +362,6 @@ class PLATFORM_EXPORT DrawingBuffer
   // ownership of the newly created texture.
   GLuint createColorTexture(const TextureParameters&);
 
-  // Create the depth/stencil and multisample buffers, if needed.
-  bool resizeMultisampleFramebuffer(const IntSize&);
-  void resizeDepthStencil(const IntSize&);
-
   // Attempts to allocator storage for, or resize all buffers. Returns whether
   // the operation was successful.
   bool resizeDefaultFramebuffer(const IntSize&);
@@ -424,8 +419,6 @@ class PLATFORM_EXPORT DrawingBuffer
   // Creates and allocates space for a default texture.
   TextureInfo createDefaultTextureAndAllocateMemory(const IntSize&);
 
-  void resizeTextureMemory(TextureInfo*, const IntSize&);
-
   // Attaches |m_colorBuffer| to |m_fbo|, which is always the source for read
   // operations.
   void attachColorBufferToReadFramebuffer();