Always enable FCM on Windows.

gpu/config/software_rendering_list_json.cc

Index: gpu/config/software_rendering_list_json.cc
diff --git a/gpu/config/software_rendering_list_json.cc b/gpu/config/software_rendering_list_json.cc
index b7c5c539801f1f42f86469f05d3ddeac10104204..926d56b02a4902e0b5eaba54e788456440e73000 100644
--- a/gpu/config/software_rendering_list_json.cc
+++ b/gpu/config/software_rendering_list_json.cc
@@ -67,7 +67,7 @@
 // "number" is used for all "op" values except "any". "number" and "number2"
 // are in the format of x, x.x, x.x.x, etc.
 // Only "driver_version" supports lexical style if the format is major.minor;
-// in that case, major is still numerical, but minor is lexical. 
+// in that case, major is still numerical, but minor is lexical.
 //
 // STRING includes "op" and "value".  "op" can be any of the following values:
 // "contains", "beginwith", "endwith", "=".  "value" is a string.
@@ -1160,6 +1160,20 @@ LONG_STRING_CONST(
       "features": [
         "webgl"
       ]
+    },
+    {
+      "id": 77,
+      "description": "Disable force compositing mode on all Windows versions prior to Vista.",
+      "os": {
+        "type": "win",
+        "version": {
+          "op": "<",
+          "number": "6.0"
+        }
+      },
+      "features": [
+        "force_compositing_mode"
+      ]
     }
   ]
 }
@@ -1167,4 +1181,3 @@ LONG_STRING_CONST(
 );  // LONG_STRING_CONST macro
 
 }  // namespace gpu
-