Remove some uses of isdigit in net/, as it can be locale depedent.

net/quic/core/quic_spdy_stream_test.cc

Index: net/quic/core/quic_spdy_stream_test.cc
diff --git a/net/quic/core/quic_spdy_stream_test.cc b/net/quic/core/quic_spdy_stream_test.cc
index 8a1fb6062690ae395e6b877abdd8856bc328e29d..386f4b2567b0ed853e10b1952ae31dbe5c548e2a 100644
--- a/net/quic/core/quic_spdy_stream_test.cc
+++ b/net/quic/core/quic_spdy_stream_test.cc
@@ -179,11 +179,19 @@ TEST_P(QuicSpdyStreamTest, ParseHeaderStatusCode) {
   Initialize(kShouldProcessData);
   int status_code = 0;
 
-  // Valid status code.
+  // Valid status codes.
   headers_[":status"] = "404";
   EXPECT_TRUE(stream_->ParseHeaderStatusCode(headers_, &status_code));
   EXPECT_EQ(404, status_code);
 
+  headers_[":status"] = "100";
+  EXPECT_TRUE(stream_->ParseHeaderStatusCode(headers_, &status_code));
+  EXPECT_EQ(100, status_code);
+
+  headers_[":status"] = "599";
+  EXPECT_TRUE(stream_->ParseHeaderStatusCode(headers_, &status_code));
+  EXPECT_EQ(599, status_code);
+
   // Invalid status codes.
   headers_[":status"] = "010";
   EXPECT_FALSE(stream_->ParseHeaderStatusCode(headers_, &status_code));
@@ -203,6 +211,12 @@ TEST_P(QuicSpdyStreamTest, ParseHeaderStatusCode) {
   headers_[":status"] = "+20";
   EXPECT_FALSE(stream_->ParseHeaderStatusCode(headers_, &status_code));
 
+  headers_[":status"] = "-10";
+  EXPECT_FALSE(stream_->ParseHeaderStatusCode(headers_, &status_code));
+
+  headers_[":status"] = "-100";
+  EXPECT_FALSE(stream_->ParseHeaderStatusCode(headers_, &status_code));
+
   // Leading or trailing spaces are also invalid.
   headers_[":status"] = " 200";
   EXPECT_FALSE(stream_->ParseHeaderStatusCode(headers_, &status_code));