Bump to WebRTC M120 release

Some API deprecation -- ExperimentalAgc and ExperimentalNs are gone.
We're continuing to carry iSAC even though it's gone upstream, but maybe
we'll want to drop that soon.

webrtc/rtc_base/strings/string_builder.h

@@ -25,16 +25,15 @@ namespace rtc {
 // when you might otherwise be tempted to use a stringstream (discouraged for
 // anything except logging). It uses a fixed-size buffer provided by the caller
 // and concatenates strings and numbers into it, allowing the results to be
-// read via |str()|.
+// read via `str()`.
 class SimpleStringBuilder {
  public:
   explicit SimpleStringBuilder(rtc::ArrayView<char> buffer);
   SimpleStringBuilder(const SimpleStringBuilder&) = delete;
   SimpleStringBuilder& operator=(const SimpleStringBuilder&) = delete;
 
-  SimpleStringBuilder& operator<<(const char* str);
   SimpleStringBuilder& operator<<(char ch);
-  SimpleStringBuilder& operator<<(const std::string& str);
+  SimpleStringBuilder& operator<<(absl::string_view str);
   SimpleStringBuilder& operator<<(int i);
   SimpleStringBuilder& operator<<(unsigned i);
   SimpleStringBuilder& operator<<(long i);                // NOLINT
@@ -45,12 +44,12 @@ class SimpleStringBuilder {
   SimpleStringBuilder& operator<<(double f);
   SimpleStringBuilder& operator<<(long double f);
 
-  // Returns a pointer to the built string. The name |str()| is borrowed for
+  // Returns a pointer to the built string. The name `str()` is borrowed for
   // compatibility reasons as we replace usage of stringstream throughout the
   // code base.
   const char* str() const { return buffer_.data(); }
 
-  // Returns the length of the string. The name |size()| is picked for STL
+  // Returns the length of the string. The name `size()` is picked for STL
   // compatibility reasons.
   size_t size() const { return size_; }
 
@@ -61,10 +60,6 @@ class SimpleStringBuilder {
   SimpleStringBuilder&
   AppendFormat(const char* fmt, ...);
 
-  // An alternate way from operator<<() to append a string. This variant is
-  // slightly more efficient when the length of the string to append, is known.
-  SimpleStringBuilder& Append(const char* str, size_t length);
-
  private:
   bool IsConsistent() const {
     return size_ <= buffer_.size() - 1 && buffer_[size_] == '\0';