Fix kType narrowing conversion in the `{}`

Since narrowing conversion in the `{}` is ill-formed in C++11, it raises
compile error with G++ 4.8.2.

BUG=

Review URL: https://codereview.chromium.org/294523007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271427 0039d316-1c4b-4281-b951-d872f2087c98

net/spdy/spdy_framer_test.cc

@@ -2912,7 +2912,7 @@ TEST_P(SpdyFramerTest, SerializeBlocked) {
   SpdyFramer framer(spdy_version_);
 
   const char kDescription[] = "BLOCKED frame";
-  const char kType = static_cast<unsigned char>(
+  const unsigned char kType = static_cast<unsigned char>(
       SpdyConstants::SerializeFrameType(spdy_version_, BLOCKED));
   const unsigned char kFrameData[] = {
     0x00, 0x00, kType, 0x00,
@@ -2978,7 +2978,7 @@ TEST_P(SpdyFramerTest, CreateAltSvc) {
   SpdyFramer framer(spdy_version_);
 
   const char kDescription[] = "ALTSVC frame";
-  const char kType = static_cast<unsigned char>(
+  const unsigned char kType = static_cast<unsigned char>(
       SpdyConstants::SerializeFrameType(spdy_version_, ALTSVC));
   const unsigned char kFrameData[] = {
     0x00, 0x17, kType, 0x00,
@@ -5224,7 +5224,7 @@ TEST_P(SpdyFramerTest, OnAltSvcBadLengths) {
     return;
   }
 
-  const char kType = static_cast<unsigned char>(
+  const unsigned char kType = static_cast<unsigned char>(
       SpdyConstants::SerializeFrameType(spdy_version_, ALTSVC));
   {
     TestSpdyVisitor visitor(spdy_version_);