Rewrite base::JSONReader to be 35-40% faster, depending on the input string.

chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc

Index: chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc
diff --git a/chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc b/chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc
index 10c145c3ed3cc9316972155eb0fadacdada69033..b501d28fc36e5c4c7e1f0e3f102bd3ca7bbca5c8 100644
--- a/chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc
+++ b/chrome/common/net/gaia/oauth2_mint_token_flow_unittest.cc
@@ -167,8 +167,7 @@ class OAuth2MintTokenFlowTest : public testing::Test {
 
   // Helper to parse the given string to DictionaryValue.
   static base::DictionaryValue* ParseJson(const std::string& str) {
-    base::JSONReader reader;
-    scoped_ptr<Value> value(reader.Read(str, false));
+    scoped_ptr<Value> value(base::JSONReader::Read(str));
     EXPECT_TRUE(value.get());
     EXPECT_EQ(Value::TYPE_DICTIONARY, value->GetType());
     return static_cast<base::DictionaryValue*>(value.release());