android envsetup: Stop adding NDK to PATH.

The only binaries in there are ndk-build, ndk-gdb, ndk-stack, and ndk-which,
neither of which is used with chromium.

BUG=330631

Review URL: https://codereview.chromium.org/141853005

git-svn-id: http://src.chromium.org/svn/trunk/src/build@248187 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/envsetup_functions.sh

@@ -55,8 +55,7 @@ common_vars_defines() {
 
   common_check_toolchain
 
-  # Add Android SDK/NDK tools to system path.
-  export PATH=$PATH:${ANDROID_NDK_ROOT}
+  # Add Android SDK tools to system path.
   export PATH=$PATH:${ANDROID_SDK_ROOT}/tools
   export PATH=$PATH:${ANDROID_SDK_ROOT}/platform-tools
   export PATH=$PATH:${ANDROID_SDK_ROOT}/build-tools/\