Replace MMappedRange with MinidumpMemoryRange.

This patch is part of a bigger patch that helps merging the breakpad code
with the modified version in Chromium OS.

The MemoryRange class was added in r895 (http://breakpad.appspot.com/332001),
which is largely based on MMappedRange but generalized to be used in other
code. However, MemoryRange does not support minidump data structures. This
patch adds a MinidumpMemoryRange class that extends MemoryRange to handle
minidump data structures, which can then replace MMappedRange.

As with MemoryRange, MinidumpMemoryRange is unit tested.

BUG=455
TEST=Tested the following:
1. Build on 32-bit and 64-bit Linux with gcc 4.4.3 and gcc 4.6.
2. Build on Mac OS X 10.6.8 with gcc 4.2 and clang 3.0 (with latest gmock).
3. All unit tests pass.
4. Run minidump-2-core to covnert a minidump file to a core file.
Review URL: http://breakpad.appspot.com/335001

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@898 4c0a9323-5329-0410-9bdc-e9ce6186880e

Makefile.am

@@ -255,7 +255,8 @@ check_PROGRAMS += \
 
 if !DISABLE_TOOLS
 check_PROGRAMS += \
-	src/common/dumper_unittest
+	src/common/dumper_unittest \
+	src/tools/linux/md2core/minidump_2_core_unittest
 endif
 endif LINUX_HOST
 
@@ -399,6 +400,19 @@ src_common_dumper_unittest_CPPFLAGS = \
 	-I$(top_srcdir)/src/testing/gtest \
 	-I$(top_srcdir)/src/testing
 endif
+
+src_tools_linux_md2core_minidump_2_core_unittest_SOURCES = \
+	src/testing/gtest/src/gtest-all.cc \
+	src/testing/gtest/src/gtest_main.cc \
+	src/testing/src/gmock-all.cc \
+	src/tools/linux/md2core/minidump_memory_range_unittest.cc
+src_tools_linux_md2core_minidump_2_core_unittest_CPPFLAGS = \
+	-I$(top_srcdir)/src \
+	-I$(top_srcdir)/src/testing/include \
+	-I$(top_srcdir)/src/testing/gtest/include \
+	-I$(top_srcdir)/src/testing/gtest \
+	-I$(top_srcdir)/src/testing
+
 endif LINUX_HOST
 
 if !DISABLE_PROCESSOR