Linux prebuilts: switch to arm-linux-gnueabihf on linux-arm

Switch the arm-32-bit sysroot to use arm-linux-gnueabihf.
All the targets we care about seem to support a HW-FPU.

Bug: 194266474
Bug: 177349647
Change-Id: I9c7b604493269dcf132d0375cd40ac9fec029b7e

gn/standalone/toolchain/BUILD.gn

@@ -124,13 +124,9 @@ declare_args() {
     _default_target_sysroot =
         rebase_path("//buildtools/debian_sid_arm64-sysroot", root_build_dir)
   } else if (target_os == "linux" && target_cpu == "arm") {
-    # TODO(primiano): Using "arm-linux-gnueabi" seems too conservative here, I
-    # think we should default to "arm-linux-gnueabihf" (which assumes a hw FPU).
-    # For now sticking with the value introduced by r.android.com/1347306.
-    # Check with chinglinyu@ and ARM and consider changing it.
-    _target_triplet = "arm-linux-gnueabi"
+    _target_triplet = "arm-linux-gnueabihf"
     _default_target_sysroot =
-        rebase_path("//buildtools/debian_sid_armel-sysroot", root_build_dir)
+        rebase_path("//buildtools/debian_sid_arm-sysroot", root_build_dir)
   } else if (target_os == "linux" && target_cpu == "x64") {
     _target_triplet = "x86_64-linux-gnu"
   } else if (target_os == "linux" && target_cpu == "x86") {

tools/install-build-deps

@@ -335,13 +335,6 @@ UI_DEPS = [
 # Sysroots required to cross-compile Linux targets (linux-arm{,64}).
 # These are taken from Chromium's build/linux/sysroot_scripts/sysroots.json.
 BUILD_DEPS_LINUX_CROSS_SYSROOTS = [
-    # TODO(primiano): I doubt anybody cares about the non-hw-FPU armel ABI.
-    # Consider dropping it, check first with CrOS and ARM folks.
-    Dependency(
-        'buildtools/debian_sid_armel-sysroot.tgz',
-        'https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/a0e2a51aaa7d779fc45415ac30c835b67caa6663/debian_sid_armel_sysroot.tar.xz',
-        '63d720325f6b3839020ad0a0d3baa4fcbedabb3e057ea029a8802c7391b25269',
-        'linux', 'all'),
     Dependency(
         'buildtools/debian_sid_arm-sysroot.tgz',
         'https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/11d6f690ca49e8ba01a1d8c5346cedad2cf308fd/debian_sid_arm_sysroot.tar.xz',