devops: teach {firefox,webkit}/build.sh to build current branch

The check for the proper branch has moved to
`checkout_build_archive_upload.sh` script.

browser_patches/checkout_build_archive_upload.sh

@@ -63,6 +63,13 @@ fi
 echo "-- preparing checkout"
 ./prepare_checkout.sh $BROWSER_NAME
 
+cd ./$BROWSER_NAME/checkout
+if ! [[ $(git rev-parse --abbrev-ref HEAD) == "playwright-build" ]]; then
+  echo "ERROR: Default branch is not playwright-build!"
+  exit 1
+fi
+cd -
+
 echo "-- cleaning"
 ./$BROWSER_NAME/clean.sh
 

browser_patches/firefox/build.sh

@@ -6,15 +6,6 @@ trap "cd $(pwd -P)" EXIT
 cd "$(dirname $0)"
 cd "checkout"
 
-BUILD_BRANCH="playwright-build"
-
-if ! [[ $(git rev-parse --abbrev-ref HEAD) == "$BUILD_BRANCH" ]]; then
-  echo "ERROR: Cannot build any branch other than $BUILD_BRANCH"
-  exit 1;
-else
-  echo "-- checking git branch is $BUILD_BRANCH - OK"
-fi
-
 if [[ "$(uname)" == "Darwin" ]]; then
   # Firefox currently does not build on 10.15 out of the box - it requires SDK for 10.14.
   # Make sure the SDK is out there.

browser_patches/webkit/build.sh

@@ -6,15 +6,6 @@ trap "cd $(pwd -P)" EXIT
 cd "$(dirname $0)"
 cd "checkout"
 
-BUILD_BRANCH="playwright-build"
-
-if ! [[ $(git rev-parse --abbrev-ref HEAD) == "$BUILD_BRANCH" ]]; then
-  echo "ERROR: Cannot build any branch other than $BUILD_BRANCH"
-  exit 1;
-else
-  echo "-- checking git branch is $BUILD_BRANCH - OK"
-fi
-
 if [[ "$(uname)" == "Darwin" ]]; then
   ./Tools/Scripts/build-webkit --release
 elif [[ "$(uname)" == "Linux" ]]; then