Remove old iOS porting files.

src/utils/ios/SkImageDecoder_iOS.mm

-/*
- * Copyright 2010 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#import <CoreGraphics/CoreGraphics.h>
-#include <CoreGraphics/CGColorSpace.h>
-#import <UIKit/UIKit.h>
-
-#include "SkImageDecoder.h"
-#include "SkImageEncoder.h"
-#include "SkMovie.h"
-#include "SkStream_NSData.h"
-
-class SkImageDecoder_iOS : public SkImageDecoder {
-protected:
-    virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode);
-};
-
-#define BITMAP_INFO (kCGBitmapByteOrder32Big | kCGImageAlphaPremultipliedLast)
-
-bool SkImageDecoder_iOS::onDecode(SkStream* stream, SkBitmap* bm, Mode mode) {
-
-    NSData* data = NSData_dataWithStream(stream);
-
-    UIImage* uimage = [UIImage imageWithData:data];
-    
-    const int width = uimage.size.width;
-    const int height = uimage.size.height;
-    bm->setInfo(SkImageInfo::MakeN32(width, height, kPremul_SkAlphaType), 0);
-    if (SkImageDecoder::kDecodeBounds_Mode == mode) {
-        return true;
-    }
-    
-    if (!this->allocPixelRef(bm, NULL)) {
-        return false;
-    }
-    
-    bm->lockPixels();
-    bm->eraseColor(0);
-    
-    CGColorSpaceRef cs = CGColorSpaceCreateDeviceRGB();
-    CGContextRef cg = CGBitmapContextCreate(bm->getPixels(), width, height,
-                                            8, bm->rowBytes(), cs, BITMAP_INFO);
-    CGContextDrawImage(cg, CGRectMake(0, 0, width, height), uimage.CGImage);
-    CGContextRelease(cg);
-    CGColorSpaceRelease(cs);
-    
-    bm->unlockPixels();
-    return true;
-}
-
-/////////////////////////////////////////////////////////////////////////
-
-SkImageDecoder* SkImageDecoder::Factory(SkStreamRewindable* stream) {
-    return new SkImageDecoder_iOS;
-}
-
-SkMovie* SkMovie::DecodeStream(SkStreamRewindable* stream) {
-    return NULL;
-}
-
-