lint: clean up use of \ as line continuation

We prefer hanging indents over \ whenever possible.  Clean things up
to use hanging indents or specific () or even omit things entirely as
the code as-is doesn't need the explicit \.

BUG=None
TEST=`cros lint` is clean & `./run_tests` passes

Change-Id: I03dbdeaba11c159a6a6ad2399037643fea361407
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2766442
Reviewed-by: Sergey Frolov <sfrolov@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/api/controller/toolchain_unittest.py b/api/controller/toolchain_unittest.py
index b8d61ef..afa0066 100644
--- a/api/controller/toolchain_unittest.py
+++ b/api/controller/toolchain_unittest.py
@@ -246,11 +246,11 @@
             BuilderConfig.Artifacts.UNVERIFIED_CHROME_LLVM_ORDERFILE],
         chroot=None, sysroot=None, input_artifacts=[
             BuilderConfig.Artifacts.InputArtifactInfo(
-                input_artifact_type=\
+                input_artifact_type=
                     BuilderConfig.Artifacts.UNVERIFIED_CHROME_LLVM_ORDERFILE,
                 input_artifact_gs_locations=['path1', 'path2']),
             BuilderConfig.Artifacts.InputArtifactInfo(
-                input_artifact_type=\
+                input_artifact_type=
                     BuilderConfig.Artifacts.UNVERIFIED_CHROME_LLVM_ORDERFILE,
                 input_artifact_gs_locations=['path3']),
         ],
@@ -270,11 +270,11 @@
             BuilderConfig.Artifacts.UNVERIFIED_CHROME_LLVM_ORDERFILE],
         chroot=None, sysroot=None, input_artifacts=[
             BuilderConfig.Artifacts.InputArtifactInfo(
-                input_artifact_type=\
+                input_artifact_type=
                     BuilderConfig.Artifacts.UNVERIFIED_CHROME_LLVM_ORDERFILE,
                 input_artifact_gs_locations=['path1', 'path2']),
             BuilderConfig.Artifacts.InputArtifactInfo(
-                input_artifact_type=\
+                input_artifact_type=
                     BuilderConfig.Artifacts.UNVERIFIED_CHROME_LLVM_ORDERFILE,
                 input_artifact_gs_locations=['path3']),
         ],
@@ -299,11 +299,11 @@
             BuilderConfig.Artifacts.UNVERIFIED_CHROME_LLVM_ORDERFILE],
         chroot=None, sysroot=None, input_artifacts=[
             BuilderConfig.Artifacts.InputArtifactInfo(
-                input_artifact_type=\
+                input_artifact_type=
                     BuilderConfig.Artifacts.UNVERIFIED_CHROME_LLVM_ORDERFILE,
                 input_artifact_gs_locations=['path1', 'path2']),
             BuilderConfig.Artifacts.InputArtifactInfo(
-                input_artifact_type=\
+                input_artifact_type=
                     BuilderConfig.Artifacts.UNVERIFIED_CHROME_LLVM_ORDERFILE,
                 input_artifact_gs_locations=['path3']),
         ])