tracing: remove WatchEvent feature

chrome/test/base/tracing.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_TEST_BASE_TRACING_H_
 #define CHROME_TEST_BASE_TRACING_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 11 matching lines @@
 //
 // Example: BeginTracing("test_MyTest*");
 // Example: BeginTracing("test_MyTest*,test_OtherStuff");
 // Example: BeginTracing("-excluded_category1,-excluded_category2");
 //
 // See base/trace_event/trace_event.h for documentation of included and excluded
 // category_patterns.
 bool BeginTracing(const std::string& category_patterns) WARN_UNUSED_RESULT;
 
 // Called from UI thread.
-// Specify a watch event in order to use the WaitForWatchEvent function.
-// After |num_occurrences| of the given event have been seen on a particular
-// process, WaitForWatchEvent will return.
-bool BeginTracingWithWatch(const std::string& category_patterns,
-                           const std::string& category_name,
-                           const std::string& event_name,
-                           int num_occurrences) WARN_UNUSED_RESULT;
-
-// Called from UI thread.
 // Begin tracing specified category_patterns on the browser.
 // |trace_config| specifies the configuration for tracing. This includes the
 // list of categories enabled, tracing modes and memory dumps configuration.
 //
 // See base/trace_event/trace_config.h for documentation of configurations.
 bool BeginTracingWithTraceConfig(
     const base::trace_event::TraceConfig& trace_config) WARN_UNUSED_RESULT;
 
 // Called from UI thread.
-// Wait on the event set with BeginTracingWithWatch. If non-zero, return after
-// |timeout| regardless of watch event notification. Returns true if watch event
-// occurred, false if it timed out.
-bool WaitForWatchEvent(base::TimeDelta timeout) WARN_UNUSED_RESULT;
-
-// Called from UI thread.
 // End trace and collect the trace output as a json string.
 bool EndTracing(std::string* json_trace_output) WARN_UNUSED_RESULT;
 
 }  // namespace tracing
 
 #endif  // CHROME_TEST_BASE_TRACING_H_