Use CopyOnWriteBuffer instead of Buffer to avoid unnecessary copies.

webrtc/base/buffer_unittest.cc

Index: webrtc/base/buffer_unittest.cc
diff --git a/webrtc/base/buffer_unittest.cc b/webrtc/base/buffer_unittest.cc
index 80d26927a227c91d24ee07e389c55c9e1691e6ba..20b09757e1295e2f68b2473687e32f4b36f1fd79 100644
--- a/webrtc/base/buffer_unittest.cc
+++ b/webrtc/base/buffer_unittest.cc
@@ -64,23 +64,6 @@ TEST(BufferTest, TestConstructArray) {
   EXPECT_EQ(0, memcmp(buf.data(), kTestData, 16));
 }
 
-TEST(BufferTest, TestConstructCopy) {
-  Buffer buf1(kTestData), buf2(buf1);
-  EXPECT_EQ(buf2.size(), 16u);
-  EXPECT_EQ(buf2.capacity(), 16u);
-  EXPECT_EQ(0, memcmp(buf2.data(), kTestData, 16));
-  EXPECT_NE(buf1.data(), buf2.data());
-  EXPECT_EQ(buf1, buf2);
-}
-
-TEST(BufferTest, TestAssign) {
-  Buffer buf1, buf2(kTestData, sizeof(kTestData), 256);
-  EXPECT_NE(buf1, buf2);
-  buf1 = buf2;
-  EXPECT_EQ(buf1, buf2);
-  EXPECT_NE(buf1.data(), buf2.data());
-}
-
 TEST(BufferTest, TestSetData) {
   Buffer buf(kTestData + 4, 7);
   buf.SetData(kTestData, 9);