Rename DexJar interface method to DexJarBuildPath.

This is a prerequisite change before adding DexJarInstallPath.

Test: lunch aosp_cf_phone-userdebug && m
Change-Id: I033e08b8bb06c0a844a6bbbfcdc48ce33e9c95cf
diff --git a/java/java.go b/java/java.go
index 09df2ad..778fe31 100644
--- a/java/java.go
+++ b/java/java.go
@@ -498,7 +498,7 @@
 	ImplementationJars() android.Paths
 	ResourceJars() android.Paths
 	ImplementationAndResourcesJars() android.Paths
-	DexJar() android.Path
+	DexJarBuildPath() android.Path
 	AidlIncludeDirs() android.Paths
 	ExportedSdkLibs() []string
 	ExportedPlugins() (android.Paths, []string)
@@ -1736,7 +1736,7 @@
 	return android.Paths{j.implementationJarFile}
 }
 
-func (j *Module) DexJar() android.Path {
+func (j *Module) DexJarBuildPath() android.Path {
 	return j.dexJarFile
 }
 
@@ -2562,7 +2562,7 @@
 	return android.Paths{j.combinedClasspathFile}
 }
 
-func (j *Import) DexJar() android.Path {
+func (j *Import) DexJarBuildPath() android.Path {
 	return nil
 }
 
@@ -2745,7 +2745,7 @@
 		j.Stem()+".jar", dexOutputFile)
 }
 
-func (j *DexImport) DexJar() android.Path {
+func (j *DexImport) DexJarBuildPath() android.Path {
 	return j.dexJarFile
 }