android envsetup: Move some webview-specific configuration into gyp_webview.

build/android/envsetup_functions.sh

Index: build/android/envsetup_functions.sh
diff --git a/build/android/envsetup_functions.sh b/build/android/envsetup_functions.sh
index 39d421e5fa111bddbeea80d55e1d6529f772409a..f179a0170ab1eea2f3eccead510d312be013d734 100755
--- a/build/android/envsetup_functions.sh
+++ b/build/android/envsetup_functions.sh
@@ -266,11 +266,4 @@ ${ANDROID_SDK_VERSION}
     DEFINES+=" tracing_like_official_build=1"
   fi
   export GYP_DEFINES="${DEFINES}"
-
-  export GYP_GENERATORS="android"
-
-  export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} default_target=All"
-  export GYP_GENERATOR_FLAGS="${GYP_GENERATOR_FLAGS} limit_to_target_all=1"
-
-  export CHROMIUM_GYP_FILE="${CHROME_SRC}/android_webview/all_webview.gyp"
 }