Remove content switches dependency in content/common/gpu.

content/public/common/content_switches.cc

 // 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.
 
 #include "build/build_config.h"
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // The number of MSAA samples for canvas2D. Requires MSAA support by GPU to
@@ skipping 347 matching lines @@
 // Enables Web Platform features that are in development.
 const char kEnableExperimentalWebPlatformFeatures[] =
     "enable-experimental-web-platform-features";
 
 // Comma-separated list of feature names to enable. See also kDisableFeatures.
 const char kEnableFeatures[] = "enable-features";
 
 // Enable Web Bluetooth.
 const char kEnableWebBluetooth[] = "enable-web-bluetooth";
 
-// Enables TRACE for GL calls in the renderer.
-const char kEnableGpuClientTracing[]        = "enable-gpu-client-tracing";
-
 // Specify that all compositor resources should be backed by GPU memory buffers.
 const char kEnableGpuMemoryBufferCompositorResources[] =
     "enable-gpu-memory-buffer-compositor-resources";
 
 // Enable GpuMemoryBuffer backed VideoFrames.
 const char kEnableGpuMemoryBufferVideoFrames[] =
     "enable-gpu-memory-buffer-video-frames";
 
 // Allow heuristics to determine when a layer tile should be drawn with the
 // Skia GPU backend. Only valid with GPU accelerated compositing +
@@ skipping 657 matching lines @@
 const char kMemoryPressureThresholdsMb[] = "memory-pressure-thresholds-mb";
 
 // Enables the exporting of the tracing events to ETW. This is only supported on
 // Windows Vista and later.
 const char kTraceExportEventsToETW[] = "trace-export-events-to-etw";
 #endif
 
 // Don't dump stuff here, follow the same order as the header.
 
 }  // namespace switches