[Android]: Roll NDK to r10b-rc1.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index ec9977b8240a45b7a91217a3a636e9cdb41c1620..7920341b9854b2024e426369f31f5b9748176b98 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -1623,7 +1623,6 @@
             # they're passed to ant which uses a different relative path from
             # gyp.
             'android_ndk_root%': '<!(cd <(DEPTH) && pwd -P)/third_party/android_tools/ndk/',
-            'android_ndk_experimental_root%': '<!(cd <(DEPTH) && pwd -P)/third_party/android_tools/ndk_experimental/',
             'android_sdk_root%': '<!(cd <(DEPTH) && pwd -P)/third_party/android_tools/sdk/',
             'android_host_arch%': '<!(uname -m)',
             # Android API-level of the SDK used for compilation.
@@ -1655,11 +1654,10 @@
             }],
             ['target_arch == "x64"', {
               'android_app_abi%': 'x86_64',
-              'android_gdbserver%': '<(android_ndk_experimental_root)/prebuilt/android-x86_64/gdbserver/gdbserver',
-              'android_ndk_sysroot%': '<(android_ndk_experimental_root)/platforms/android-L/arch-x86_64',
+              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-x86_64/gdbserver/gdbserver',
+              'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-L/arch-x86_64',
               'android_ndk_lib_dir%': 'usr/lib64',
-              'android_toolchain%': '<(android_ndk_experimental_root)/toolchains/x86_64-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
-              'android_stlport_root': '<(android_ndk_experimental_root)/sources/cxx-stl/stlport',
+              'android_toolchain%': '<(android_ndk_root)/toolchains/x86_64-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch=="arm"', {
               'conditions': [
@@ -1676,11 +1674,10 @@
             }],
             ['target_arch == "arm64"', {
               'android_app_abi%': 'arm64-v8a',
-              'android_gdbserver%': '<(android_ndk_experimental_root)/prebuilt/android-arm64/gdbserver/gdbserver',
-              'android_ndk_sysroot%': '<(android_ndk_experimental_root)/platforms/android-L/arch-arm64',
+              'android_gdbserver%': '<(android_ndk_root)/prebuilt/android-arm64/gdbserver/gdbserver',
+              'android_ndk_sysroot%': '<(android_ndk_root)/platforms/android-L/arch-arm64',
               'android_ndk_lib_dir%': 'usr/lib',
-              'android_toolchain%': '<(android_ndk_experimental_root)/toolchains/aarch64-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
-              'android_stlport_root': '<(android_ndk_experimental_root)/sources/cxx-stl/stlport',
+              'android_toolchain%': '<(android_ndk_root)/toolchains/aarch64-linux-android-4.9/prebuilt/<(host_os)-<(android_host_arch)/bin',
             }],
             ['target_arch == "mipsel"', {
               'android_app_abi%': 'mips',