Make several service protocol RPCs private.

runtime/vm/service/service.md

 # Dart VM Service Protocol 0.0
 
 This document describes _version 0.0_ of the Dart VM Service Protocol.
 This protocol is used to communicate with a running Dart Virtual
 Machine.
 
 To use the Service Protocol, start the VM with the *--observe* flag.
 The VM will start a webserver which services protocol requests via WebSocket.
 It is possible to make HTTP (non-WebSocket) requests,
 but this does not allow access to VM _events_ and is not documented
@@ skipping 10 matching lines @@
 - [Events](#events)
 - [Types](#types)
 - [IDs and Names](#ids-and-names)
 - [Versioning](#versioning)
 - [Private RPCs, Types, and Properties](#private-rpcs-types-and-properties)
 - [Public RPCs](#public-rpcs)
         - [addBreakpoint](#addbreakpoint)
         - [addBreakpointAtEntry](#addbreakpointatentry)
         - [evaluate](#evaluate)
         - [evaluateInFrame](#evaluateinframe)
-        - [getCoverage](#getcoverage)
         - [getFlagList](#getflaglist)
         - [getIsolate](#getisolate)
         - [getObject](#getobject)
         - [getStack](#getstack)
         - [getVersion](#getversion)
         - [getVM](#getvm)
         - [pause](#pause)
         - [removeBreakpoint](#removebreakpoint)
         - [resume](#resume)
         - [setName](#setname)
         - [streamCancel](#streamcancel)
         - [streamListen](#streamlisten)
 - [Public Types](#public-types)
         - [Bool](#bool)
         - [BoundField](#boundfield)
         - [BoundVariable](#boundvariable)
         - [Breakpoint](#breakpoint)
         - [Class](#class)
         - [ClassList](#classlist)
         - [Code](#code)
-        - [CodeCoverage](#codecoverage)
         - [CodeKind](#codekind)
         - [Double](#double)
         - [Error](#error)
         - [Event](#event)
         - [EventType](#eventtype)
         - [Field](#field)
         - [Flag](#flag)
         - [FlagList](#flaglist)
         - [FlagType](#flagtype)
         - [Frame](#frame)
@@ skipping 366 matching lines @@
 The _evaluateInFrame_ RPC is used to evaluate an expression in the context of
 a particular stack frame.  _frame_ is the index of the desired [Frame](#frame),
 with an index of _0_ indicating the top (most recent) frame.
 
 If an error occurs while evaluating the expression, an [@Error](#error)
 reference will be returned.
 
 If the expression is evaluated successfully, an [@Instance](#instance)
 reference will be returned.
 
-### getCoverage
-
-```
-CodeCoverage getCoverage(string isolateId,
-                         string targetId)
-```
-
-The _getCoverage_ RPC is used to retrieve current code coverage
-information for some target.
-
-_targetId_ may refer to a [Script](#script), [Library](#library),
-[Class](#class), or [Function](#function).
-
-See [Coverage](#coverage).
-
 ### getFlagList
 
 ```
 FlagList getFlagList()
 ```
 
 The _getFlagList RPC returns a list of all command line flags in the
 VM along with their current values.
 
 See [FlagList](#flaglist).
@@ skipping 393 matching lines @@
   // A name for this code object.
   string name;
 
   // What kind of code object is this?
   CodeKind kind;
 }
 ```
 
 A _Code_ object represents compiled code in the Dart VM.
 
-### CodeCoverage
-
-TODO
-
 ### CodeKind
 
 ```
 enum CodeKind {
   Dart,
   Native,
   Stub,
   Tag,
   Collected
 }
@@ skipping 869 matching lines @@
   // A list of isolates running in the VM.
   @Isolate[] isolates
 }
 ```
 
 ## Revision History
 
 version | comments
 ------- | --------
 0.0 | draft