Code cleanup and typos in trace_event [NFC]

base/trace_event/trace_event.h

 // Copyright (c) 2012 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 BASE_TRACE_EVENT_TRACE_EVENT_H_
 #define BASE_TRACE_EVENT_TRACE_EVENT_H_
 
 // This header file defines implementation details of how the trace macros in
 // trace_event_common.h collect and store trace events. Anything not
 // implementation-specific should go in trace_event_common.h instead of here.
@@ skipping 32 matching lines @@
     trace_event_internal::TraceID::DontMangle(id)
 
 // By default, trace IDs are eventually converted to a single 64-bit number. Use
 // this macro to add a scope string. For example,
 //
 // TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(
 //     "network", "ResourceLoad",
 //     TRACE_ID_WITH_SCOPE("BlinkResourceID", resourceID));
 //
 // Also, it is possible to prepend the ID with another number, like the process
-// ID. This is useful in creatin IDs that are unique among all processes. To do
+// ID. This is useful in creating IDs that are unique among all processes. To do
 // that, pass two numbers after the scope string instead of one. For example,
 //
 // TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(
 //     "network", "ResourceLoad",
 //     TRACE_ID_WITH_SCOPE("BlinkResourceID", pid, resourceID));
 #define TRACE_ID_WITH_SCOPE(scope, ...) \
   trace_event_internal::TraceID::WithScope(scope, ##__VA_ARGS__)
 
 #define TRACE_ID_GLOBAL(id) trace_event_internal::TraceID::GlobalId(id)
 #define TRACE_ID_LOCAL(id) trace_event_internal::TraceID::LocalId(id)
@@ skipping 1045 matching lines @@
   const char* name_;
   IDType id_;
 
   DISALLOW_COPY_AND_ASSIGN(TraceScopedTrackableObject);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_EVENT_H_