gpu/khronos_glcts_support: Move target_defaults into separate file

gpu/khronos_glcts_support/khronos_glcts.gypi

Index: gpu/khronos_glcts_support/khronos_glcts.gypi
diff --git a/gpu/khronos_glcts_support/khronos_glcts.gypi b/gpu/khronos_glcts_support/khronos_glcts.gypi
index 07d9cd1953fd9687b843a00e782bae8db2be7185..30fe78c81b2a2f1455e93821631fb09e49617daa 100644
--- a/gpu/khronos_glcts_support/khronos_glcts.gypi
+++ b/gpu/khronos_glcts_support/khronos_glcts.gypi
@@ -3,34 +3,6 @@
 # found in the LICENSE file.
 
 {
-  'target_defaults': {
-    'defines': [
-      'DEQP_TARGET_NAME="chrome-gpu-command-buffer"',
-      'DEQP_SUPPORT_GLES2=1',
-      'DEQP_SUPPORT_EGL=1',
-      'GTF_API=GTF_GLES20',
-    ],
-    'conditions': [
-      ['OS=="linux"', {
-        'defines': [
-          '_XOPEN_SOURCE=500',
-        ],
-        'cflags!': [
-          '-fno-exceptions',
-        ],
-        'cflags_cc!': [
-          '-fno-exceptions',
-        ],
-        'target_conditions': [
-          ['_type=="static_library"', {
-            'cflags_cc!': [
-              '-fno-rtti',
-            ],
-          }],
-        ],
-      }],
-    ],
-  },
   'variables': {
 
     # WA: Suppress [chromium-style] enforcement errors when compiled with