Remove GYP_GENERATORS=ninja code from android envsetup.

build/gyp_chromium already makes GYP_GENERATORS default to ninja on linux
these days.

BUG=330631

Review URL: https://codereview.chromium.org/121023002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@242576 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/envsetup_functions.sh

@@ -141,16 +141,6 @@ ${ANDROID_SDK_BUILD_TOOLS_VERSION}
 common_gyp_vars() {
   export GYP_DEFINES="${DEFINES}"
 
-  # Set GYP_GENERATORS to ninja if it's currently unset or null.
-  if [ -z "$GYP_GENERATORS" ]; then
-    echo "Defaulting GYP_GENERATORS to ninja."
-    GYP_GENERATORS=ninja
-  elif [ "$GYP_GENERATORS" != "ninja" ]; then
-    echo "Warning: GYP_GENERATORS set to '$GYP_GENERATORS'."
-    echo "Only GYP_GENERATORS=ninja has continuous coverage."
-  fi
-  export GYP_GENERATORS
-
   # Use our All target as the default
   export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} default_target=All"