Misc cleanup in net/spdy/core.

net/spdy/core/array_output_buffer_test.cc

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/spdy/core/array_output_buffer.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace net {
 namespace test {
 
 // This test verifies that ArrayOutputBuffer is initialized properly.
 TEST(ArrayOutputBufferTest, InitializedFromArray) {
   char array[100];
   ArrayOutputBuffer buffer(array, sizeof(array));
   EXPECT_EQ(sizeof(array), buffer.BytesFree());
-  EXPECT_EQ((uint64_t)0, buffer.Size());
+  EXPECT_EQ(0u, buffer.Size());
   EXPECT_EQ(array, buffer.Begin());
 }
 
 // This test verifies that Reset() causes an ArrayOutputBuffer's capacity and
 // size to be reset to the initial state.
 TEST(ArrayOutputBufferTest, WriteAndReset) {
   char array[100];
   ArrayOutputBuffer buffer(array, sizeof(array));
 
   // Let's write some bytes.
   char* dst;
   int size;
   buffer.Next(&dst, &size);
   ASSERT_GT(size, 1);
   ASSERT_NE(nullptr, dst);
   const int64_t written = size / 2;
   memset(dst, 'x', written);
   buffer.AdvanceWritePtr(written);
 
   // The buffer should be partially used.
-  EXPECT_EQ((uint64_t)size - written, buffer.BytesFree());
-  EXPECT_EQ((uint64_t)written, buffer.Size());
+  EXPECT_EQ(static_cast<uint64_t>(size) - written, buffer.BytesFree());
+  EXPECT_EQ(static_cast<uint64_t>(written), buffer.Size());
 
   buffer.Reset();
 
   // After a reset, the buffer should regain its full capacity.
   EXPECT_EQ(sizeof(array), buffer.BytesFree());
-  EXPECT_EQ((uint64_t)0, buffer.Size());
+  EXPECT_EQ(0u, buffer.Size());
 }
 
 }  // namespace test
 }  // namespace net