Don't fetch ninja, the depot_tools already ships it.

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "vendor/ninja"]
-	path = vendor/ninja
-	url = https://github.com/martine/ninja

script/bootstrap

@@ -6,12 +6,9 @@ cd "$(dirname $0)/.."
 SOURCE_ROOT=$(pwd -P)
 VENDOR_DIR="${SOURCE_ROOT}/vendor"
 DEPOT_TOOLS_DIR="${VENDOR_DIR}/depot_tools"
-NINJA_DIR="${VENDOR_DIR}/ninja"
 
 git submodule sync
 git submodule update --init --recursive
 test -d "${DEPOT_TOOLS_DIR}" || git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git "${DEPOT_TOOLS_DIR}"
 
-"${NINJA_DIR}/bootstrap.py"
-
 "${SOURCE_ROOT}/script/update"

script/build

@@ -5,8 +5,9 @@ set -e
 cd "$(dirname $0)/.."
 SOURCE_ROOT=$(pwd -P)
 VENDOR_DIR="${SOURCE_ROOT}/vendor"
-NINJA_DIR="${VENDOR_DIR}/ninja"
+DEPOT_TOOLS_DIR="${VENDOR_DIR}/depot_tools"
+NINJA="${DEPOT_TOOLS_DIR}/ninja"
 CHROMIUM_DIR="${VENDOR_DIR}/chromium"
 
-"${NINJA_DIR}/ninja" -C "${CHROMIUM_DIR}/src/out/Debug" chromiumcontent
-"${NINJA_DIR}/ninja" -C "${CHROMIUM_DIR}/src/out/Release" chromiumcontent
+"${NINJA}" -C "${CHROMIUM_DIR}/src/out/Debug" chromiumcontent
+"${NINJA}" -C "${CHROMIUM_DIR}/src/out/Release" chromiumcontent

vendor/ninja

@@ -1 +0,0 @@
-Subproject commit 2c953d1501de5195e2485185fa24a2ebfd76bbb5