Revert of Enable both static and dynamically linked libpng

gyp/libpng.gyp

 # Copyright 2014 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'skia_warnings_as_errors': 0,
   },
   'targets': [
     {
       'target_name': 'libpng',
-      'type': 'none',
       'conditions': [
-        [ 'skia_os == "android"',
+        [ 'skia_libpng_static',
           {
+            'type': 'static_library',
+            'include_dirs': [
+              '../third_party/externals/libpng',
+              # Needed for generated pnglibconf.h
+              '../third_party/libpng',
+            ],
             'dependencies': [
-              'android_deps.gyp:png',
+              'zlib.gyp:zlib',
             ],
             'export_dependent_settings': [
-              'android_deps.gyp:png',
+              'zlib.gyp:zlib',
             ],
-          }, {  # skia_os != "android"
-            'dependencies': [
-              'libpng.gyp:libpng_static',
+            'direct_dependent_settings': {
+              'include_dirs': [
+                '../third_party/externals/libpng',
+                # Needed for generated pnglibconf.h
+                '../third_party/libpng',
+              ],
+            },
+            'cflags': [
+              '-w',
+              '-fvisibility=hidden',
             ],
-            'export_dependent_settings': [
-              'libpng.gyp:libpng_static',
+            'conditions': [
+              ['not arm_neon', {
+                'defines': [
+                    # FIXME: Why is this needed? Without it, pngpriv.h sets it
+                    # to 2 if __ARM_NEON is defined, but shouldn't __ARM_NEON
+                    # not be defined since arm_neon is 0?
+                    'PNG_ARM_NEON_OPT=0',
+                ],
+              }],
             ],
+            'sources': [
+              '../third_party/externals/libpng/png.c',
+              '../third_party/externals/libpng/pngerror.c',
+              '../third_party/externals/libpng/pngget.c',
+              '../third_party/externals/libpng/pngmem.c',
+              '../third_party/externals/libpng/pngpread.c',
+              '../third_party/externals/libpng/pngread.c',
+              '../third_party/externals/libpng/pngrio.c',
+              '../third_party/externals/libpng/pngrtran.c',
+              '../third_party/externals/libpng/pngrutil.c',
+              '../third_party/externals/libpng/pngset.c',
+              '../third_party/externals/libpng/pngtrans.c',
+              '../third_party/externals/libpng/pngwio.c',
+              '../third_party/externals/libpng/pngwrite.c',
+              '../third_party/externals/libpng/pngwtran.c',
+              '../third_party/externals/libpng/pngwutil.c',
+            ],
+          }, {  # not skia_libpng_static
+            'type': 'none',
+            'conditions': [
+              [ 'skia_os == "android"',
+                {
+                  # TODO(halcanary): merge all png targets into this file.
+                  'dependencies': [
+                    'android_deps.gyp:png',
+                  ],
+                  'export_dependent_settings': [
+                    'android_deps.gyp:png',
+                  ],
+                }, {  # skia_os != "android"
+                  'dependencies': [
+                    'zlib.gyp:zlib',
+                    ],
+                  'export_dependent_settings': [
+                    'zlib.gyp:zlib',
+                    ],
+                  'direct_dependent_settings': {
+                    'link_settings': {
+                      'libraries': [
+                        '-lpng',
+                      ],
+                    },
+                  },
+                }
+              ]
+            ]
           }
         ]
-      ]
-    },
-    {
-      'target_name': 'libpng_static',
-      'type': 'static_library',
-      'standalone_static_library': 1,
-      'include_dirs': [
-        # Needed for generated pnglibconf.h and pngprefix.h
-        '../third_party/libpng',
-        '../third_party/externals/libpng',
-      ],
-      'dependencies': [
-        'zlib.gyp:zlib',
-      ],
-      'export_dependent_settings': [
-        'zlib.gyp:zlib',
-      ],
-      'direct_dependent_settings': {
-        'include_dirs': [
-          '../third_party/externals/libpng',
-          # Needed for generated pnglibconf.h and pngprefix.h
-          '../third_party/libpng',
-        ],
-        'defines': [
-          'SKIA_PNG_PREFIXED',
-        ],
-      },
-      'cflags': [
-        '-w',
-        '-fvisibility=hidden',
-      ],
-      'defines': [
-        'SKIA_PNG_PREFIXED',
-      ],
-      'sources': [
-        '../third_party/externals/libpng/png.c',
-        '../third_party/externals/libpng/pngerror.c',
-        '../third_party/externals/libpng/pngget.c',
-        '../third_party/externals/libpng/pngmem.c',
-        '../third_party/externals/libpng/pngpread.c',
-        '../third_party/externals/libpng/pngread.c',
-        '../third_party/externals/libpng/pngrio.c',
-        '../third_party/externals/libpng/pngrtran.c',
-        '../third_party/externals/libpng/pngrutil.c',
-        '../third_party/externals/libpng/pngset.c',
-        '../third_party/externals/libpng/pngtrans.c',
-        '../third_party/externals/libpng/pngwio.c',
-        '../third_party/externals/libpng/pngwrite.c',
-        '../third_party/externals/libpng/pngwtran.c',
-        '../third_party/externals/libpng/pngwutil.c',
-      ],
-      'conditions': [
-        ['arm_neon or arm_neon_optional', {
-          'sources': [
-            '../third_party/externals/libpng/arm/arm_init.c',
-            '../third_party/externals/libpng/arm/filter_neon.S',
-            '../third_party/externals/libpng/arm/filter_neon_intrinsics.c',
-          ],
-        }],
       ],
     },
   ]
 }