Revert "Move webrtc/{base => rtc_base}" (https://codereview.webrtc.org/2877023002)

Will reland in two different commits to preserve git blame history.

BUG=webrtc:7634
NOTRY=True
TBR=kwiberg@webrtc.org

Change-Id: I550da8525aeb9c5b8f96338fcf1c9714f3dcdab1
Reviewed-on: https://chromium-review.googlesource.com/554610
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18820}
diff --git a/webrtc/base/fakesslidentity.h b/webrtc/base/fakesslidentity.h
index da204b2..7065fc0 100644
--- a/webrtc/base/fakesslidentity.h
+++ b/webrtc/base/fakesslidentity.h
@@ -11,9 +11,110 @@
 #ifndef WEBRTC_BASE_FAKESSLIDENTITY_H_
 #define WEBRTC_BASE_FAKESSLIDENTITY_H_
 
+#include <algorithm>
+#include <memory>
+#include <vector>
 
-// This header is deprecated and is just left here temporarily during
-// refactoring. See https://bugs.webrtc.org/7634 for more details.
-#include "webrtc/rtc_base/fakesslidentity.h"
+#include "webrtc/base/checks.h"
+#include "webrtc/base/messagedigest.h"
+#include "webrtc/base/sslidentity.h"
+
+namespace rtc {
+
+class FakeSSLCertificate : public rtc::SSLCertificate {
+ public:
+  // SHA-1 is the default digest algorithm because it is available in all build
+  // configurations used for unit testing.
+  explicit FakeSSLCertificate(const std::string& data)
+      : data_(data), digest_algorithm_(DIGEST_SHA_1), expiration_time_(-1) {}
+  explicit FakeSSLCertificate(const std::vector<std::string>& certs)
+      : data_(certs.front()),
+        digest_algorithm_(DIGEST_SHA_1),
+        expiration_time_(-1) {
+    std::vector<std::string>::const_iterator it;
+    // Skip certs[0].
+    for (it = certs.begin() + 1; it != certs.end(); ++it) {
+      certs_.push_back(FakeSSLCertificate(*it));
+    }
+  }
+  FakeSSLCertificate* GetReference() const override {
+    return new FakeSSLCertificate(*this);
+  }
+  std::string ToPEMString() const override {
+    return data_;
+  }
+  void ToDER(Buffer* der_buffer) const override {
+    std::string der_string;
+    RTC_CHECK(SSLIdentity::PemToDer(kPemTypeCertificate, data_, &der_string));
+    der_buffer->SetData(der_string.c_str(), der_string.size());
+  }
+  int64_t CertificateExpirationTime() const override {
+    return expiration_time_;
+  }
+  void SetCertificateExpirationTime(int64_t expiration_time) {
+    expiration_time_ = expiration_time;
+  }
+  void set_digest_algorithm(const std::string& algorithm) {
+    digest_algorithm_ = algorithm;
+  }
+  bool GetSignatureDigestAlgorithm(std::string* algorithm) const override {
+    *algorithm = digest_algorithm_;
+    return true;
+  }
+  bool ComputeDigest(const std::string& algorithm,
+                     unsigned char* digest,
+                     size_t size,
+                     size_t* length) const override {
+    *length = rtc::ComputeDigest(algorithm, data_.c_str(), data_.size(),
+                                       digest, size);
+    return (*length != 0);
+  }
+  std::unique_ptr<SSLCertChain> GetChain() const override {
+    if (certs_.empty())
+      return nullptr;
+    std::vector<SSLCertificate*> new_certs(certs_.size());
+    std::transform(certs_.begin(), certs_.end(), new_certs.begin(), DupCert);
+    std::unique_ptr<SSLCertChain> chain(new SSLCertChain(new_certs));
+    std::for_each(new_certs.begin(), new_certs.end(), DeleteCert);
+    return chain;
+  }
+
+ private:
+  static FakeSSLCertificate* DupCert(FakeSSLCertificate cert) {
+    return cert.GetReference();
+  }
+  static void DeleteCert(SSLCertificate* cert) { delete cert; }
+  std::string data_;
+  std::vector<FakeSSLCertificate> certs_;
+  std::string digest_algorithm_;
+  // Expiration time in seconds relative to epoch, 1970-01-01T00:00:00Z (UTC).
+  int64_t expiration_time_;
+};
+
+class FakeSSLIdentity : public rtc::SSLIdentity {
+ public:
+  explicit FakeSSLIdentity(const std::string& data) : cert_(data) {}
+  explicit FakeSSLIdentity(const FakeSSLCertificate& cert) : cert_(cert) {}
+  virtual FakeSSLIdentity* GetReference() const {
+    return new FakeSSLIdentity(*this);
+  }
+  virtual const FakeSSLCertificate& certificate() const { return cert_; }
+  virtual std::string PrivateKeyToPEMString() const {
+    RTC_NOTREACHED();  // Not implemented.
+    return "";
+  }
+  virtual std::string PublicKeyToPEMString() const {
+    RTC_NOTREACHED();  // Not implemented.
+    return "";
+  }
+  virtual bool operator==(const SSLIdentity& other) const {
+    RTC_NOTREACHED();  // Not implemented.
+    return false;
+  }
+ private:
+  FakeSSLCertificate cert_;
+};
+
+}  // namespace rtc
 
 #endif  // WEBRTC_BASE_FAKESSLIDENTITY_H_