Revert of Use CopyOnWriteBuffer instead of Buffer to avoid unnecessary copies.

webrtc/base/copyonwritebuffer_unittest.cc

Index: webrtc/base/copyonwritebuffer_unittest.cc
diff --git a/webrtc/base/copyonwritebuffer_unittest.cc b/webrtc/base/copyonwritebuffer_unittest.cc
index dbf59f7718f2779f0dff9bc0c3c26d79918a00c5..a95ad67a03e6ec2c41ad1210d3ae241f590ed3e7 100644
--- a/webrtc/base/copyonwritebuffer_unittest.cc
+++ b/webrtc/base/copyonwritebuffer_unittest.cc
@@ -39,13 +39,6 @@
   const uint8_t* data1 = buf1.cdata();
   const uint8_t* data2 = buf2.cdata();
   EXPECT_NE(data1, data2);
-}
-
-TEST(CopyOnWriteBufferTest, TestCreateEmptyData) {
-  CopyOnWriteBuffer buf(static_cast<const uint8_t*>(nullptr), 0);
-  EXPECT_EQ(buf.size(), 0u);
-  EXPECT_EQ(buf.capacity(), 0u);
-  EXPECT_EQ(buf.data(), nullptr);
 }
 
 TEST(CopyOnWriteBufferTest, TestMoveConstruct) {
@@ -132,21 +125,6 @@
   EnsureBuffersDontShareData(buf1, buf3);
   const int8_t exp[] = {'f', 'o', 'o', 0x0};
   EXPECT_EQ(buf3, CopyOnWriteBuffer(exp));
-
-  buf2.SetData(static_cast<const uint8_t*>(nullptr), 0u);
-  EnsureBuffersDontShareData(buf1, buf2);
-  EXPECT_EQ(buf1.size(), 3u);
-  EXPECT_EQ(buf1.capacity(), 10u);
-  EXPECT_EQ(buf2.size(), 0u);
-  EXPECT_EQ(buf2.capacity(), 0u);
-}
-
-TEST(CopyOnWriteBufferTest, TestSetDataEmpty) {
-  CopyOnWriteBuffer buf;
-  buf.SetData(static_cast<const uint8_t*>(nullptr), 0u);
-  EXPECT_EQ(buf.size(), 0u);
-  EXPECT_EQ(buf.capacity(), 0u);
-  EXPECT_EQ(buf.data(), nullptr);
 }
 
 TEST(CopyOnWriteBufferTest, TestEnsureCapacity) {
@@ -218,43 +196,4 @@
   EXPECT_EQ(data2, cdata1);
 }
 
-TEST(CopyOnWriteBufferTest, TestBacketRead) {
-  CopyOnWriteBuffer buf1(kTestData, 3, 10);
-  CopyOnWriteBuffer buf2(buf1);
-
-  EnsureBuffersShareData(buf1, buf2);
-  // Non-const reads clone the data if shared.
-  for (size_t i = 0; i != 3u; ++i) {
-    EXPECT_EQ(buf1[i], kTestData[i]);
-  }
-  EnsureBuffersDontShareData(buf1, buf2);
-}
-
-TEST(CopyOnWriteBufferTest, TestBacketReadConst) {
-  CopyOnWriteBuffer buf1(kTestData, 3, 10);
-  CopyOnWriteBuffer buf2(buf1);
-
-  EnsureBuffersShareData(buf1, buf2);
-  const CopyOnWriteBuffer& cbuf1 = buf1;
-  for (size_t i = 0; i != 3u; ++i) {
-    EXPECT_EQ(cbuf1[i], kTestData[i]);
-  }
-  EnsureBuffersShareData(buf1, buf2);
-}
-
-TEST(CopyOnWriteBufferTest, TestBacketWrite) {
-  CopyOnWriteBuffer buf1(kTestData, 3, 10);
-  CopyOnWriteBuffer buf2(buf1);
-
-  EnsureBuffersShareData(buf1, buf2);
-  for (size_t i = 0; i != 3u; ++i) {
-    buf1[i] = kTestData[i] + 1;
-  }
-  EXPECT_EQ(buf1.size(), 3u);
-  EXPECT_EQ(buf1.capacity(), 10u);
-  EXPECT_EQ(buf2.size(), 3u);
-  EXPECT_EQ(buf2.capacity(), 10u);
-  EXPECT_EQ(0, memcmp(buf2.cdata(), kTestData, 3));
-}
-
 }  // namespace rtc