android envsetup: Stop adding build-tools dir (aidl, aapt, dx, dexdump) to PATH.

It looks like everything looks qualified paths to reference the binaries
in this folder already.

BUG=330631
NOTRY=true

Review URL: https://codereview.chromium.org/167053003

git-svn-id: http://src.chromium.org/svn/trunk/src/build@251493 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/envsetup_functions.sh

@@ -17,8 +17,6 @@ common_vars_defines() {
   # 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/\
-${ANDROID_SDK_BUILD_TOOLS_VERSION}
 
   # Add Chromium Android development scripts to system path.
   # Must be after CHROME_SRC is set.