Add base namespace to more values in sync and elsewhere.

cc/base/math_util.cc

Index: cc/base/math_util.cc
diff --git a/cc/base/math_util.cc b/cc/base/math_util.cc
index c3c7b1c3b538ddddeeb508650f708cc0a7ad0e47..544395652822bd37a5584f732c88362c92326dfe 100644
--- a/cc/base/math_util.cc
+++ b/cc/base/math_util.cc
@@ -536,7 +536,7 @@ scoped_ptr<base::Value> MathUtil::AsValue(gfx::Rect r) {
 }
 
 bool MathUtil::FromValue(const base::Value* raw_value, gfx::Rect* out_rect) {
-  const ListValue* value = NULL;
+  const base::ListValue* value = NULL;
   if (!raw_value->GetAsList(&value))
     return false;