Revert of Switch SkJpegCode to libjpeg-turbo (patchset #28 id:710001 of https://codereview.chromium.org/1180983002/)

Reason for revert:
Broke iOS build.

Original issue's description:
> Add libjpeg-turbo library (depends on yasm)
> Mangle external function names to avoid conflict with libjpeg
> Take advantage of direct color conversion (RGBA, BGRA, 565)
> Prepare to use jpeg_skip_scanlines (when it is upstreamed)
>
> BUG=skia:
>
> Committed: https://skia.googlesource.com/skia/+/b60c3f8291529303299262dba19b1a896060bd2d
>
> Committed: https://skia.googlesource.com/skia/+/f8bf9181d7b0463c8e371755cfbb9ece90b34fc5
>
> Committed: https://skia.googlesource.com/skia/+/e9e3ee33f30c14c31afd5fc3fe4dda7f15783c75

TBR=scroggo@google.com,djsollen@google.com,emmaleer@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1213093003
diff --git a/gyp/codec.gyp b/gyp/codec.gyp
index c008590..0d54184 100644
--- a/gyp/codec.gyp
+++ b/gyp/codec.gyp
@@ -18,12 +18,9 @@
       'dependencies': [
         'core.gyp:*',
         'giflib.gyp:giflib',
-        'libjpeg-turbo.gyp:libjpeg-turbo',
+        'libjpeg.gyp:libjpeg',
         'libwebp.gyp:libwebp',
       ],
-      'export_dependent_settings': [
-        'libjpeg-turbo.gyp:libjpeg-turbo',
-      ],
       'cflags':[
         # FIXME: This gets around a longjmp warning. See
         # http://build.chromium.org/p/client.skia.compile/builders/Build-Ubuntu-GCC-x86_64-Release-Trybot/builds/113/steps/build%20most/logs/stdio
@@ -63,23 +60,10 @@
             'dependencies': [
               'libpng.gyp:libpng',
             ],
-            # TODO(msarett): update libjpeg-turbo on Android so we can compile SkJpegCodec
-            # for the framework.
-            'sources!': [
-              '../src/codec/SkJpegCodec.cpp',
-              '../src/codec/SkJpegDecoderMgr.cpp',
-              '../src/codec/SkJpegUtility_codec.cpp',
-            ],
-            'dependencies!': [
-              'libjpeg-turbo.gyp:libjpeg-turbo',
-            ],
           }, {  # !skia_android_framework
             'dependencies': [
               'libpng.gyp:libpng_static',
             ],
-            'cflags': [
-              '-DTURBO_HAS_SKIP',
-            ],
           }
         ]
       ]