Use explicit relative imports in skia_gold Python code.

Implicit relative imports do not work in Python 3.

Bug: pdfium:1674
Change-Id: I01c9cf8497ce116cfc9ee5f218396fcb65b6224a
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/79491
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
diff --git a/testing/tools/skia_gold/__init__.py b/testing/tools/skia_gold/__init__.py
index 3415b87..a16cacc 100644
--- a/testing/tools/skia_gold/__init__.py
+++ b/testing/tools/skia_gold/__init__.py
@@ -1,4 +1,3 @@
-# pylint: disable=relative-import
-import path_util
+from . import path_util
 
 path_util.AddDirToPathIfNeeded(path_util.GetPDFiumDir(), 'build')
diff --git a/testing/tools/skia_gold/pdfium_skia_gold_properties.py b/testing/tools/skia_gold/pdfium_skia_gold_properties.py
index b90d2c3..525b212 100644
--- a/testing/tools/skia_gold/pdfium_skia_gold_properties.py
+++ b/testing/tools/skia_gold/pdfium_skia_gold_properties.py
@@ -4,11 +4,10 @@
 # found in the LICENSE file.
 """PDFium implementation of //build/skia_gold_common/skia_gold_properties.py."""
 
-# pylint: disable=relative-import
 import subprocess
 import sys
 
-import path_util
+from . import path_util
 from skia_gold_common import skia_gold_properties
 
 
diff --git a/testing/tools/skia_gold/pdfium_skia_gold_session_manager.py b/testing/tools/skia_gold/pdfium_skia_gold_session_manager.py
index 4eed413..55724b9 100644
--- a/testing/tools/skia_gold/pdfium_skia_gold_session_manager.py
+++ b/testing/tools/skia_gold/pdfium_skia_gold_session_manager.py
@@ -5,8 +5,7 @@
 """PDFium implementation of
 //build/skia_gold_common/skia_gold_session_manager.py."""
 
-# pylint: disable=relative-import
-import pdfium_skia_gold_session
+from . import pdfium_skia_gold_session
 from skia_gold_common import skia_gold_session_manager as sgsm
 
 SKIA_PDF_INSTANCE = 'pdfium'
diff --git a/testing/tools/skia_gold/skia_gold.py b/testing/tools/skia_gold/skia_gold.py
index ca61f3f..112a560 100644
--- a/testing/tools/skia_gold/skia_gold.py
+++ b/testing/tools/skia_gold/skia_gold.py
@@ -8,9 +8,8 @@
 import shlex
 import shutil
 
-# pylint: disable=relative-import
-import pdfium_skia_gold_properties
-import pdfium_skia_gold_session_manager
+from . import pdfium_skia_gold_properties
+from . import pdfium_skia_gold_session_manager
 
 GS_BUCKET = 'skia-pdfium-gm'