[telemetry] Change many relative paths to use util.Get*Dir().

tools/telemetry/telemetry/core/chrome/android_browser_finder.py

Index: tools/telemetry/telemetry/core/chrome/android_browser_finder.py
diff --git a/tools/telemetry/telemetry/core/chrome/android_browser_finder.py b/tools/telemetry/telemetry/core/chrome/android_browser_finder.py
index bf1172ca494fa9bde6faca05cab5160891f09e31..c85d32a22a1fbaa4667ff96d9888ea9b1a370811 100644
--- a/tools/telemetry/telemetry/core/chrome/android_browser_finder.py
+++ b/tools/telemetry/telemetry/core/chrome/android_browser_finder.py
@@ -12,6 +12,7 @@ import sys
 from telemetry.core import browser
 from telemetry.core import possible_browser
 from telemetry.core import profile_types
+from telemetry.core import util
 from telemetry.core.chrome import adb_commands
 from telemetry.core.chrome import android_browser_backend
 from telemetry.core.platform import android_platform_backend
@@ -91,8 +92,7 @@ def CanFindAvailableBrowsers(logging=real_logging):
           logging.warn('  sudo `which adb` devices\n\n')
         adb_works = True
     except OSError:
-      platform_tools_path = os.path.join(
-          os.path.dirname(__file__), '..', '..', '..', '..', '..'
+      platform_tools_path = os.path.join(util.GetChromiumSrcDir(),
           'third_party', 'android_tools', 'sdk', 'platform-tools')
       if (sys.platform.startswith('linux') and
           os.path.exists(os.path.join(platform_tools_path, 'adb'))):