Remove ENABLE_WEBGL #define as it's always enabled in Blink

Source/WebKit/chromium/WebKit.gyp

Index: Source/WebKit/chromium/WebKit.gyp
diff --git a/Source/WebKit/chromium/WebKit.gyp b/Source/WebKit/chromium/WebKit.gyp
index c60bffde6a9532043f53cda963b9a369d4558dcb..da5ec5e6a1570ef95e717d78137c598fec6be0c8 100644
--- a/Source/WebKit/chromium/WebKit.gyp
+++ b/Source/WebKit/chromium/WebKit.gyp
@@ -698,6 +698,12 @@
                     'include_dirs': [
                         'public/mac',
                     ],
+                    'link_settings': {
+                        'libraries': [
+                            '$(SDKROOT)/System/Library/Frameworks/Accelerate.framework',
+                            '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
+                        ],
+                    },
                 }, { # else: OS!="mac"
                     'sources/': [
                         ['exclude', '/mac/'],
@@ -714,18 +720,6 @@
                         'chromium_code': 1,
                     }
                 }],
-                ['"ENABLE_WEBGL=1" in feature_defines', {
-                    'conditions': [
-                        ['OS=="mac"', {
-                            'link_settings': {
-                                'libraries': [
-                                    '$(SDKROOT)/System/Library/Frameworks/Accelerate.framework',
-                                    '$(SDKROOT)/System/Library/Frameworks/OpenGL.framework',
-                                ],
-                            },
-                        }],
-                    ],
-                }],
                 ['use_default_render_theme==1', {
                     'include_dirs': [
                         'public/default',