Revert "GYP variable v8_optimized_debug should be overridable by GYP_DEFINES"

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 6210f82303f32ba01f0bcb49d441fa90468f1de9..f9d2ca0ad8be559af01149becf8be2db7a505f89 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -736,9 +736,9 @@
         # on android_clang, where we're hitting a weird linker error.
         # TODO(dpranke): http://crbug.com/266155 .
         ['OS=="android"', {
-          'v8_optimized_debug%': 1,
+          'v8_optimized_debug': 1,
         }, {
-          'v8_optimized_debug%': 2,
+          'v8_optimized_debug': 2,
         }],
       ],
 
@@ -897,7 +897,7 @@
     'spdy_proxy_auth_value%': '<(spdy_proxy_auth_value)',
     'enable_mdns%' : '<(enable_mdns)',
     'enable_enhanced_bookmarks%' : '<(enable_enhanced_bookmarks)',
-    'v8_optimized_debug%': '<(v8_optimized_debug)',
+    'v8_optimized_debug': '<(v8_optimized_debug)',
     'proprietary_codecs%': '<(proprietary_codecs)',
 
     # Use system nspr instead of the bundled one.