Divide up hprof code by classes.

This divides the _class, _heap, _output and _string files
among hprof.cc and hprof_record.cc.

This removes the use of mutex locks on class and string
collections. This does not otherwise change the body of any
functions, just which files they live in.

Change-Id: I88521529dbe3e00bd88ec0030a6105dceda9500d
diff --git a/build/Android.common.mk b/build/Android.common.mk
index 7ded084..968228b 100644
--- a/build/Android.common.mk
+++ b/build/Android.common.mk
@@ -122,10 +122,7 @@
 	src/heap.cc \
 	src/heap_bitmap.cc \
 	src/hprof/hprof.cc \
-	src/hprof/hprof_class.cc \
-	src/hprof/hprof_heap.cc \
-	src/hprof/hprof_output.cc \
-	src/hprof/hprof_string.cc \
+	src/hprof/hprof_record.cc \
 	src/image.cc \
 	src/image_writer.cc \
 	src/indirect_reference_table.cc \