Remove deprecated StringBuffer.add, addAll and addCharCode.

sdk/lib/core/string_buffer.dart

Index: sdk/lib/core/string_buffer.dart
diff --git a/sdk/lib/core/string_buffer.dart b/sdk/lib/core/string_buffer.dart
index 07d3277066e8832c6077c805a8ed37aee8ebe77d..3b0d5b47adc856d77549387dd8dca4df9167aad4 100644
--- a/sdk/lib/core/string_buffer.dart
+++ b/sdk/lib/core/string_buffer.dart
@@ -23,14 +23,6 @@ class StringBuffer implements StringSink {
   /** Returns whether the buffer is empty. This is a constant-time operation. */
   bool get isEmpty => length == 0;
 
-  /**
-   * Converts [obj] to a string and adds it to the buffer.
-   *
-   * *Deprecated*. Use [write] instead.
-   */
-  @deprecated
-  void add(Object obj) => write(obj);
-
   external void write(Object obj);
 
   void writeAll(Iterable objects) {
@@ -42,32 +34,12 @@ class StringBuffer implements StringSink {
     write("\n");
   }
 
-  /**
-   * Adds the string representation of [charCode] to the buffer.
-   *
-   * *Deprecated* Use [writeCharCode] instead.
-   */
-  @deprecated
-  void addCharCode(int charCode) {
-    writeCharCode(charCode);
-  }
-
   /// Adds the string representation of [charCode] to the buffer.
   void writeCharCode(int charCode) {
     write(new String.fromCharCode(charCode));
   }
 
   /**
-   * Adds all items in [objects] to the buffer.
-   *
-   * *Deprecated*. Use [writeAll] instead.
-   */
-  @deprecated
-  void addAll(Iterable objects) {
-    for (Object obj in objects) write(obj);
-  }
-
-  /**
    * Clears the string buffer.
    *
    * *Deprecated*.