Don't call out -lstdc++ -lm explicitly.

gyp/common_conditions.gypi

 # conditions used in both common.gypi and skia.gyp in chromium
 #
 {
   'defines': [
     'SK_ALLOW_STATIC_GLOBAL_INITIALIZERS=<(skia_static_initializers)',
     'SK_SUPPORT_GPU=<(skia_gpu)',
     'SK_SUPPORT_OPENCL=<(skia_opencl)',
     'SK_FORCE_DISTANCEFIELD_FONTS=<(skia_force_distancefield_fonts)',
   ],
   'conditions' : [
@@ skipping 418 matching lines @@
                 '-lppapi',
                 '-lppapi_cpp',
                 '-lnosys',
                 '-pthread',
               ],
               'ldflags': [
                 '-L<(nacl_sdk_root)/lib/newlib_x86_<(skia_arch_width)/Release',
                 '-L<(nacl_sdk_root)/ports/lib/newlib_x86_<(skia_arch_width)/Release',
               ],
             },
-          }, { # skia_os != "nacl"
-            'link_settings': {
-              'ldflags': [
-                '-lstdc++',
-                '-lm',
-              ],
-            },
           }],
           # Enable asan, tsan, etc.
           [ 'skia_sanitizer', {
             'cflags': [
               '-fsanitize=<(skia_sanitizer)',
             ],
             'ldflags': [
               '-fsanitize=<(skia_sanitizer)',
             ],
             'conditions' : [
@@ skipping 175 matching lines @@
         'configurations': {
           'Debug': {
             'cflags': ['-g']
           },
           'Release': {
             'cflags': ['-O2'],
             'defines': [ 'NDEBUG' ],
           },
         },
         'libraries': [
-          '-lstdc++',
-          '-lm',
           '-llog',
         ],
         'cflags': [
           '-fuse-ld=gold',
         ],
         'conditions': [
           [ 'skia_arch_type == "x86"', {
             'cflags': [
               '-mssse3',
             ],
           }],
           [ 'skia_android_framework', {
-            'libraries!': [
-              '-lstdc++',
-              '-lm',
-            ],
             'cflags!': [
               '-fuse-ld=gold',
             ],
           }],
           [ 'skia_shared_lib', {
             'defines': [
               'SKIA_DLL',
               'SKIA_IMPLEMENTATION=1',
               # Needed until we fix skbug.com/2440.
               'SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG',
@@ skipping 23 matching lines @@
     [ 'skia_crash_handler', {
       'defines': [ 'SK_CRASH_HANDLER' ],
     }],
 
   ], # end 'conditions'
   # The Xcode SYMROOT must be at the root. See build/common.gypi in chromium for more details
   'xcode_settings': {
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }