Remove header file that doesn't exist from build files.

media/base/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/ui.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//media/media_options.gni")
 
@@ skipping 114 matching lines @@
     "player_tracker.cc",
     "player_tracker.h",
     "ranges.cc",
     "ranges.h",
     "renderer.cc",
     "renderer.h",
     "renderer_factory.cc",
     "renderer_factory.h",
     "sample_format.cc",
     "sample_format.h",
-    "scoped_histogram_timer.h",
     "seekable_buffer.cc",
     "seekable_buffer.h",
     "serial_runner.cc",
     "serial_runner.h",
     "simd/convert_rgb_to_yuv.h",
     "simd/convert_rgb_to_yuv_c.cc",
     "simd/convert_yuv_to_rgb.h",
     "simd/convert_yuv_to_rgb_c.cc",
     "simd/filter_yuv.h",
     "simd/filter_yuv_c.cc",
@@ skipping 325 matching lines @@
       if (is_posix) {
         yasm_flags += [ "-DELF" ]
         if (cpu_arch == "x64") {
           # TODO(ajwong): Why isn't this true in mac?
           yasm_flags += [ "-DPIC" ]
         }
       }
     }
   }
 }