diff --git a/http2/adapter/data_source.cc b/http2/adapter/data_source.cc
deleted file mode 100644
index 13f89d2..0000000
--- a/http2/adapter/data_source.cc
+++ /dev/null
@@ -1,23 +0,0 @@
-#include "http2/adapter/data_source.h"
-
-namespace http2 {
-namespace adapter {
-
-StringDataSource::StringDataSource(std::string data)
-    : data_(std::move(data)), remaining_(data_) {
-  state_ = remaining_.empty() ? DONE : READY;
-}
-
-absl::string_view StringDataSource::NextData() const {
-  return remaining_;
-}
-
-void StringDataSource::Consume(size_t bytes) {
-  remaining_.remove_prefix(std::min(bytes, remaining_.size()));
-  if (remaining_.empty()) {
-    state_ = DONE;
-  }
-}
-
-}  // namespace adapter
-}  // namespace http2
diff --git a/http2/adapter/data_source.h b/http2/adapter/data_source.h
index 2509358..d8d507b 100644
--- a/http2/adapter/data_source.h
+++ b/http2/adapter/data_source.h
@@ -32,45 +32,6 @@
   virtual bool send_fin() const = 0;
 };
 
-// Represents a HTTP message body.
-class DataSource {
- public:
-  virtual ~DataSource() {}
-
-  enum State {
-    // The source is not done, but cannot currently provide more data.
-    NOT_READY,
-    // The source can provide more data.
-    READY,
-    // The source is done.
-    DONE,
-  };
-
-  State state() const { return state_; }
-
-  // The next range of data provided by this data source.
-  virtual absl::string_view NextData() const = 0;
-
-  // Indicates that |bytes| bytes have been consumed by the caller.
-  virtual void Consume(size_t bytes) = 0;
-
- protected:
-  State state_ = NOT_READY;
-};
-
-// A simple implementation constructible from a string_view or std::string.
-class StringDataSource : public DataSource {
- public:
-  explicit StringDataSource(std::string data);
-
-  absl::string_view NextData() const override;
-  void Consume(size_t bytes) override;
-
- private:
-  const std::string data_;
-  absl::string_view remaining_;
-};
-
 }  // namespace adapter
 }  // namespace http2
 
diff --git a/http2/adapter/data_source_test.cc b/http2/adapter/data_source_test.cc
deleted file mode 100644
index c290124..0000000
--- a/http2/adapter/data_source_test.cc
+++ /dev/null
@@ -1,40 +0,0 @@
-#include "http2/adapter/data_source.h"
-
-#include "common/platform/api/quiche_test.h"
-
-namespace http2 {
-namespace adapter {
-namespace test {
-namespace {
-
-TEST(StringDataSourceTest, EmptyString) {
-  StringDataSource source("");
-
-  EXPECT_EQ(source.state(), DataSource::DONE);
-  EXPECT_THAT(source.NextData(), testing::IsEmpty());
-}
-
-TEST(StringDataSourceTest, PartialConsume) {
-  StringDataSource source("I'm a HTTP message body. Really!");
-
-  EXPECT_EQ(source.state(), DataSource::READY);
-  EXPECT_THAT(source.NextData(), testing::Not(testing::IsEmpty()));
-  source.Consume(6);
-  EXPECT_EQ(source.state(), DataSource::READY);
-  EXPECT_THAT(source.NextData(), testing::StartsWith("HTTP"));
-
-  source.Consume(0);
-  EXPECT_EQ(source.state(), DataSource::READY);
-  EXPECT_THAT(source.NextData(), testing::StartsWith("HTTP"));
-
-  // Consumes more than the remaining bytes available.
-  source.Consume(50);
-  EXPECT_THAT(source.NextData(), testing::IsEmpty())
-      << "next data: " << source.NextData();
-  EXPECT_EQ(source.state(), DataSource::DONE);
-}
-
-}  // namespace
-}  // namespace test
-}  // namespace adapter
-}  // namespace http2