Only use the PGO optimizations on chrome_child.dll

tools/telemetry/telemetry/internal/platform/profiler/win_pgo_profiler.py

Index: tools/telemetry/telemetry/internal/platform/profiler/win_pgo_profiler.py
diff --git a/tools/telemetry/telemetry/internal/platform/profiler/win_pgo_profiler.py b/tools/telemetry/telemetry/internal/platform/profiler/win_pgo_profiler.py
index 664749b1b851b884999989f372402f4006460026..163e9e6190a209e5c82612580ebae7ecdba393d0 100644
--- a/tools/telemetry/telemetry/internal/platform/profiler/win_pgo_profiler.py
+++ b/tools/telemetry/telemetry/internal/platform/profiler/win_pgo_profiler.py
@@ -31,7 +31,6 @@ class WinPGOProfiler(profiler.Profiler):
            ' this.' % _PGOSWEEP_EXECUTABLE)
 
     self._browser_dir = browser_backend.browser_directory
-    self._chrome_pgc_counter = self._GetNextProfileIndex('chrome')
     self._chrome_child_pgc_counter = self._GetNextProfileIndex('chrome_child')
 
   def _GetNextProfileIndex(self, dll_name):
@@ -93,9 +92,4 @@ class WinPGOProfiler(profiler.Profiler):
                                               'chrome_child',
                                               self._chrome_child_pgc_counter))
         self._chrome_child_pgc_counter += 1
-      elif 'browser0' in output_file:
-        output_files.append(self._RunPGOSweep(pid,
-                                              'chrome',
-                                              self._chrome_pgc_counter))
-        self._chrome_pgc_counter += 1
     return output_files