Removed parsing and output for unused --target-api switch in dx.

This is cherry-picked from dalvik-dev.

Change-Id: I74627e4c261e086e8c2c7cf38591cd3e9f5707e6
diff --git a/dx/src/com/android/dx/command/Main.java b/dx/src/com/android/dx/command/Main.java
index 69f9864..d0bbbe2 100644
--- a/dx/src/com/android/dx/command/Main.java
+++ b/dx/src/com/android/dx/command/Main.java
@@ -35,7 +35,7 @@
         "[--dump-width=<n>]\n" +
         "  [--dump-method=<name>[*]] [--verbose-dump] [--no-files] " +
         "[--core-library]\n" +
-        "  [--num-threads=<n>] [--target-api=<n>]\n" +
+        "  [--num-threads=<n>]\n" +
         "  [<file>.class | <file>.{zip,jar,apk} | <directory>] ...\n" +
         "    Convert a set of classfiles into a dex file, optionally " +
         "embedded in a\n" +
diff --git a/dx/src/com/android/dx/command/dexer/Main.java b/dx/src/com/android/dx/command/dexer/Main.java
index 621a32a..d127550 100644
--- a/dx/src/com/android/dx/command/dexer/Main.java
+++ b/dx/src/com/android/dx/command/dexer/Main.java
@@ -1117,22 +1117,6 @@
                 } else if (parser.isArg("--dump-method=")) {
                     methodToDump = parser.getLastValue();
                     jarOutput = false;
-                } else if (parser.isArg("--target-api=")) {
-                    String arg = parser.getLastValue();
-                    int value;
-                    try {
-                        value = Integer.parseInt(arg);
-                    } catch (NumberFormatException ex) {
-                        value = -1;
-                    }
-                    if (value < 1) {
-                        System.err.println("improper target-api option: " + arg);
-                        throw new UsageException();
-                    }
-                    // TODO: this currently causes confusion for unbundled apps.
-                    // What we call 'target' is what developers call 'min', so
-                    // they're accidentally turning on new opcodes.
-                    // targetApiLevel = value;
                 } else if (parser.isArg("--positions=")) {
                     String pstr = parser.getLastValue().intern();
                     if (pstr == "none") {